diff --git a/gui/hsudoku.ui b/gui/hsudoku.ui
new file mode 100644
--- /dev/null
+++ b/gui/hsudoku.ui
@@ -0,0 +1,2968 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!-- Generated with glade 3.20.0 -->
+<interface>
+  <requires lib="gtk+" version="3.20"/>
+  <!-- interface-css-provider-path theme.css -->
+  <object class="GtkPopover" id="inputPopover">
+    <property name="name">inputPopover</property>
+    <property name="can_focus">False</property>
+    <property name="relative_to">box1</property>
+    <property name="modal">False</property>
+    <child>
+      <object class="GtkBox" id="box1">
+        <property name="visible">True</property>
+        <property name="can_focus">False</property>
+        <property name="orientation">vertical</property>
+        <child>
+          <object class="GtkGrid">
+            <property name="visible">True</property>
+            <property name="can_focus">False</property>
+            <child>
+              <object class="GtkButton" id="input1">
+                <property name="label" translatable="yes">1</property>
+                <property name="name">inputPopover</property>
+                <property name="visible">True</property>
+                <property name="can_focus">True</property>
+                <property name="receives_default">True</property>
+                <property name="hexpand">True</property>
+                <property name="vexpand">True</property>
+              </object>
+              <packing>
+                <property name="left_attach">0</property>
+                <property name="top_attach">0</property>
+              </packing>
+            </child>
+            <child>
+              <object class="GtkButton" id="input4">
+                <property name="label" translatable="yes">4</property>
+                <property name="name">inputPopover</property>
+                <property name="visible">True</property>
+                <property name="can_focus">True</property>
+                <property name="receives_default">True</property>
+                <property name="hexpand">True</property>
+                <property name="vexpand">True</property>
+              </object>
+              <packing>
+                <property name="left_attach">0</property>
+                <property name="top_attach">1</property>
+              </packing>
+            </child>
+            <child>
+              <object class="GtkButton" id="input7">
+                <property name="label" translatable="yes">7</property>
+                <property name="name">inputPopover</property>
+                <property name="visible">True</property>
+                <property name="can_focus">True</property>
+                <property name="receives_default">True</property>
+                <property name="hexpand">True</property>
+                <property name="vexpand">True</property>
+              </object>
+              <packing>
+                <property name="left_attach">0</property>
+                <property name="top_attach">2</property>
+              </packing>
+            </child>
+            <child>
+              <object class="GtkButton" id="input2">
+                <property name="label" translatable="yes">2</property>
+                <property name="name">inputPopover</property>
+                <property name="visible">True</property>
+                <property name="can_focus">True</property>
+                <property name="receives_default">True</property>
+                <property name="hexpand">True</property>
+                <property name="vexpand">True</property>
+              </object>
+              <packing>
+                <property name="left_attach">1</property>
+                <property name="top_attach">0</property>
+              </packing>
+            </child>
+            <child>
+              <object class="GtkButton" id="input5">
+                <property name="label" translatable="yes">5</property>
+                <property name="name">inputPopover</property>
+                <property name="visible">True</property>
+                <property name="can_focus">True</property>
+                <property name="receives_default">True</property>
+                <property name="hexpand">True</property>
+                <property name="vexpand">True</property>
+              </object>
+              <packing>
+                <property name="left_attach">1</property>
+                <property name="top_attach">1</property>
+              </packing>
+            </child>
+            <child>
+              <object class="GtkButton" id="input8">
+                <property name="label" translatable="yes">8</property>
+                <property name="name">inputPopover</property>
+                <property name="visible">True</property>
+                <property name="can_focus">True</property>
+                <property name="receives_default">True</property>
+                <property name="hexpand">True</property>
+                <property name="vexpand">True</property>
+              </object>
+              <packing>
+                <property name="left_attach">1</property>
+                <property name="top_attach">2</property>
+              </packing>
+            </child>
+            <child>
+              <object class="GtkButton" id="input3">
+                <property name="label" translatable="yes">3</property>
+                <property name="name">inputPopover</property>
+                <property name="visible">True</property>
+                <property name="can_focus">True</property>
+                <property name="receives_default">True</property>
+                <property name="hexpand">True</property>
+                <property name="vexpand">True</property>
+              </object>
+              <packing>
+                <property name="left_attach">2</property>
+                <property name="top_attach">0</property>
+              </packing>
+            </child>
+            <child>
+              <object class="GtkButton" id="input6">
+                <property name="label" translatable="yes">6</property>
+                <property name="name">inputPopover</property>
+                <property name="visible">True</property>
+                <property name="can_focus">True</property>
+                <property name="receives_default">True</property>
+                <property name="hexpand">True</property>
+                <property name="vexpand">True</property>
+              </object>
+              <packing>
+                <property name="left_attach">2</property>
+                <property name="top_attach">1</property>
+              </packing>
+            </child>
+            <child>
+              <object class="GtkButton" id="input9">
+                <property name="label" translatable="yes">9</property>
+                <property name="name">inputPopover</property>
+                <property name="visible">True</property>
+                <property name="can_focus">True</property>
+                <property name="receives_default">True</property>
+                <property name="hexpand">True</property>
+                <property name="vexpand">True</property>
+              </object>
+              <packing>
+                <property name="left_attach">2</property>
+                <property name="top_attach">2</property>
+              </packing>
+            </child>
+          </object>
+          <packing>
+            <property name="expand">False</property>
+            <property name="fill">True</property>
+            <property name="position">0</property>
+          </packing>
+        </child>
+        <child>
+          <object class="GtkButton" id="inputClear">
+            <property name="label" translatable="yes">Clear</property>
+            <property name="visible">True</property>
+            <property name="can_focus">True</property>
+            <property name="receives_default">True</property>
+          </object>
+          <packing>
+            <property name="expand">False</property>
+            <property name="fill">True</property>
+            <property name="position">1</property>
+          </packing>
+        </child>
+        <child>
+          <object class="GtkButton" id="inputSolve">
+            <property name="label" translatable="yes">Cheat</property>
+            <property name="visible">True</property>
+            <property name="can_focus">True</property>
+            <property name="receives_default">True</property>
+          </object>
+          <packing>
+            <property name="expand">False</property>
+            <property name="fill">True</property>
+            <property name="position">2</property>
+          </packing>
+        </child>
+      </object>
+    </child>
+  </object>
+  <object class="GtkWindow" id="mainWindow">
+    <property name="can_focus">False</property>
+    <property name="title" translatable="yes">Hsudoku</property>
+    <property name="window_position">center</property>
+    <property name="icon">icon.png</property>
+    <child>
+      <object class="GtkOverlay">
+        <property name="visible">True</property>
+        <property name="can_focus">False</property>
+        <property name="hexpand">True</property>
+        <property name="vexpand">True</property>
+        <child>
+          <object class="GtkBox" id="mainBox">
+            <property name="name">container</property>
+            <property name="visible">True</property>
+            <property name="can_focus">False</property>
+            <property name="hexpand">True</property>
+            <property name="vexpand">True</property>
+            <property name="orientation">vertical</property>
+            <child>
+              <object class="GtkGrid">
+                <property name="name">mainGrid</property>
+                <property name="visible">True</property>
+                <property name="can_focus">False</property>
+                <property name="hexpand">True</property>
+                <property name="vexpand">True</property>
+                <child>
+                  <object class="GtkGrid">
+                    <property name="visible">True</property>
+                    <property name="can_focus">False</property>
+                    <property name="hexpand">True</property>
+                    <property name="vexpand">True</property>
+                    <child>
+                      <object class="GtkBox">
+                        <property name="visible">True</property>
+                        <property name="can_focus">False</property>
+                        <property name="hexpand">True</property>
+                        <property name="vexpand">True</property>
+                        <property name="orientation">vertical</property>
+                        <child>
+                          <object class="GtkButton" id="cell1">
+                            <property name="label" translatable="yes"> </property>
+                            <property name="name">cell1</property>
+                            <property name="visible">True</property>
+                            <property name="can_focus">True</property>
+                            <property name="receives_default">True</property>
+                            <property name="hexpand">True</property>
+                            <property name="vexpand">True</property>
+                            <property name="relief">none</property>
+                          </object>
+                          <packing>
+                            <property name="expand">False</property>
+                            <property name="fill">True</property>
+                            <property name="position">0</property>
+                          </packing>
+                        </child>
+                      </object>
+                      <packing>
+                        <property name="left_attach">0</property>
+                        <property name="top_attach">0</property>
+                      </packing>
+                    </child>
+                    <child>
+                      <object class="GtkBox">
+                        <property name="visible">True</property>
+                        <property name="can_focus">False</property>
+                        <property name="hexpand">True</property>
+                        <property name="vexpand">True</property>
+                        <property name="orientation">vertical</property>
+                        <child>
+                          <object class="GtkButton" id="cell10">
+                            <property name="label" translatable="yes"> </property>
+                            <property name="name">cell10</property>
+                            <property name="visible">True</property>
+                            <property name="can_focus">True</property>
+                            <property name="receives_default">True</property>
+                            <property name="hexpand">True</property>
+                            <property name="vexpand">True</property>
+                            <property name="relief">none</property>
+                          </object>
+                          <packing>
+                            <property name="expand">False</property>
+                            <property name="fill">True</property>
+                            <property name="position">0</property>
+                          </packing>
+                        </child>
+                      </object>
+                      <packing>
+                        <property name="left_attach">0</property>
+                        <property name="top_attach">1</property>
+                      </packing>
+                    </child>
+                    <child>
+                      <object class="GtkBox">
+                        <property name="visible">True</property>
+                        <property name="can_focus">False</property>
+                        <property name="hexpand">True</property>
+                        <property name="vexpand">True</property>
+                        <property name="orientation">vertical</property>
+                        <child>
+                          <object class="GtkButton" id="cell19">
+                            <property name="label" translatable="yes"> </property>
+                            <property name="name">cell19</property>
+                            <property name="visible">True</property>
+                            <property name="can_focus">True</property>
+                            <property name="receives_default">True</property>
+                            <property name="hexpand">True</property>
+                            <property name="vexpand">True</property>
+                            <property name="relief">none</property>
+                          </object>
+                          <packing>
+                            <property name="expand">False</property>
+                            <property name="fill">True</property>
+                            <property name="position">0</property>
+                          </packing>
+                        </child>
+                      </object>
+                      <packing>
+                        <property name="left_attach">0</property>
+                        <property name="top_attach">2</property>
+                      </packing>
+                    </child>
+                    <child>
+                      <object class="GtkBox">
+                        <property name="visible">True</property>
+                        <property name="can_focus">False</property>
+                        <property name="hexpand">True</property>
+                        <property name="vexpand">True</property>
+                        <property name="orientation">vertical</property>
+                        <child>
+                          <object class="GtkButton" id="cell2">
+                            <property name="label" translatable="yes"> </property>
+                            <property name="name">cell2</property>
+                            <property name="visible">True</property>
+                            <property name="can_focus">True</property>
+                            <property name="receives_default">True</property>
+                            <property name="hexpand">True</property>
+                            <property name="vexpand">True</property>
+                            <property name="relief">none</property>
+                          </object>
+                          <packing>
+                            <property name="expand">False</property>
+                            <property name="fill">True</property>
+                            <property name="position">0</property>
+                          </packing>
+                        </child>
+                      </object>
+                      <packing>
+                        <property name="left_attach">1</property>
+                        <property name="top_attach">0</property>
+                      </packing>
+                    </child>
+                    <child>
+                      <object class="GtkBox">
+                        <property name="visible">True</property>
+                        <property name="can_focus">False</property>
+                        <property name="hexpand">True</property>
+                        <property name="vexpand">True</property>
+                        <property name="orientation">vertical</property>
+                        <child>
+                          <object class="GtkButton" id="cell11">
+                            <property name="label" translatable="yes"> </property>
+                            <property name="name">cell11</property>
+                            <property name="visible">True</property>
+                            <property name="can_focus">True</property>
+                            <property name="receives_default">True</property>
+                            <property name="hexpand">True</property>
+                            <property name="vexpand">True</property>
+                            <property name="relief">none</property>
+                          </object>
+                          <packing>
+                            <property name="expand">False</property>
+                            <property name="fill">True</property>
+                            <property name="position">0</property>
+                          </packing>
+                        </child>
+                      </object>
+                      <packing>
+                        <property name="left_attach">1</property>
+                        <property name="top_attach">1</property>
+                      </packing>
+                    </child>
+                    <child>
+                      <object class="GtkBox">
+                        <property name="visible">True</property>
+                        <property name="can_focus">False</property>
+                        <property name="hexpand">True</property>
+                        <property name="vexpand">True</property>
+                        <property name="orientation">vertical</property>
+                        <child>
+                          <object class="GtkButton" id="cell20">
+                            <property name="label" translatable="yes"> </property>
+                            <property name="name">cell20</property>
+                            <property name="visible">True</property>
+                            <property name="can_focus">True</property>
+                            <property name="receives_default">True</property>
+                            <property name="hexpand">True</property>
+                            <property name="vexpand">True</property>
+                            <property name="relief">none</property>
+                          </object>
+                          <packing>
+                            <property name="expand">False</property>
+                            <property name="fill">True</property>
+                            <property name="position">0</property>
+                          </packing>
+                        </child>
+                      </object>
+                      <packing>
+                        <property name="left_attach">1</property>
+                        <property name="top_attach">2</property>
+                      </packing>
+                    </child>
+                    <child>
+                      <object class="GtkBox">
+                        <property name="visible">True</property>
+                        <property name="can_focus">False</property>
+                        <property name="hexpand">True</property>
+                        <property name="vexpand">True</property>
+                        <property name="orientation">vertical</property>
+                        <child>
+                          <object class="GtkButton" id="cell3">
+                            <property name="label" translatable="yes"> </property>
+                            <property name="name">cell3</property>
+                            <property name="visible">True</property>
+                            <property name="can_focus">True</property>
+                            <property name="receives_default">True</property>
+                            <property name="hexpand">True</property>
+                            <property name="vexpand">True</property>
+                            <property name="relief">none</property>
+                          </object>
+                          <packing>
+                            <property name="expand">False</property>
+                            <property name="fill">True</property>
+                            <property name="position">0</property>
+                          </packing>
+                        </child>
+                      </object>
+                      <packing>
+                        <property name="left_attach">2</property>
+                        <property name="top_attach">0</property>
+                      </packing>
+                    </child>
+                    <child>
+                      <object class="GtkBox">
+                        <property name="visible">True</property>
+                        <property name="can_focus">False</property>
+                        <property name="hexpand">True</property>
+                        <property name="vexpand">True</property>
+                        <property name="orientation">vertical</property>
+                        <child>
+                          <object class="GtkButton" id="cell12">
+                            <property name="label" translatable="yes"> </property>
+                            <property name="name">cell12</property>
+                            <property name="visible">True</property>
+                            <property name="can_focus">True</property>
+                            <property name="receives_default">True</property>
+                            <property name="hexpand">True</property>
+                            <property name="vexpand">True</property>
+                            <property name="relief">none</property>
+                          </object>
+                          <packing>
+                            <property name="expand">False</property>
+                            <property name="fill">True</property>
+                            <property name="position">0</property>
+                          </packing>
+                        </child>
+                      </object>
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+                        <property name="left_attach">2</property>
+                        <property name="top_attach">1</property>
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+                    </child>
+                    <child>
+                      <object class="GtkBox">
+                        <property name="visible">True</property>
+                        <property name="can_focus">False</property>
+                        <property name="hexpand">True</property>
+                        <property name="vexpand">True</property>
+                        <property name="orientation">vertical</property>
+                        <child>
+                          <object class="GtkButton" id="cell21">
+                            <property name="label" translatable="yes"> </property>
+                            <property name="name">cell21</property>
+                            <property name="visible">True</property>
+                            <property name="can_focus">True</property>
+                            <property name="receives_default">True</property>
+                            <property name="hexpand">True</property>
+                            <property name="vexpand">True</property>
+                            <property name="relief">none</property>
+                          </object>
+                          <packing>
+                            <property name="expand">False</property>
+                            <property name="fill">True</property>
+                            <property name="position">0</property>
+                          </packing>
+                        </child>
+                      </object>
+                      <packing>
+                        <property name="left_attach">2</property>
+                        <property name="top_attach">2</property>
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+                    <property name="left_attach">0</property>
+                    <property name="top_attach">0</property>
+                  </packing>
+                </child>
+                <child>
+                  <object class="GtkGrid">
+                    <property name="visible">True</property>
+                    <property name="can_focus">False</property>
+                    <property name="hexpand">True</property>
+                    <property name="vexpand">True</property>
+                    <child>
+                      <object class="GtkBox">
+                        <property name="visible">True</property>
+                        <property name="can_focus">False</property>
+                        <property name="hexpand">True</property>
+                        <property name="vexpand">True</property>
+                        <property name="orientation">vertical</property>
+                        <child>
+                          <object class="GtkButton" id="cell28">
+                            <property name="label" translatable="yes"> </property>
+                            <property name="name">cell28</property>
+                            <property name="visible">True</property>
+                            <property name="can_focus">True</property>
+                            <property name="receives_default">True</property>
+                            <property name="hexpand">True</property>
+                            <property name="vexpand">True</property>
+                            <property name="relief">none</property>
+                          </object>
+                          <packing>
+                            <property name="expand">False</property>
+                            <property name="fill">True</property>
+                            <property name="position">0</property>
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+                        <property name="top_attach">0</property>
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+                      <object class="GtkBox">
+                        <property name="visible">True</property>
+                        <property name="can_focus">False</property>
+                        <property name="hexpand">True</property>
+                        <property name="vexpand">True</property>
+                        <property name="orientation">vertical</property>
+                        <child>
+                          <object class="GtkButton" id="cell37">
+                            <property name="label" translatable="yes"> </property>
+                            <property name="name">cell37</property>
+                            <property name="visible">True</property>
+                            <property name="can_focus">True</property>
+                            <property name="receives_default">True</property>
+                            <property name="hexpand">True</property>
+                            <property name="vexpand">True</property>
+                            <property name="relief">none</property>
+                          </object>
+                          <packing>
+                            <property name="expand">False</property>
+                            <property name="fill">True</property>
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+                          </packing>
+                        </child>
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+                        <property name="top_attach">1</property>
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+                      <object class="GtkBox">
+                        <property name="visible">True</property>
+                        <property name="can_focus">False</property>
+                        <property name="hexpand">True</property>
+                        <property name="vexpand">True</property>
+                        <property name="orientation">vertical</property>
+                        <child>
+                          <object class="GtkButton" id="cell46">
+                            <property name="label" translatable="yes"> </property>
+                            <property name="name">cell46</property>
+                            <property name="visible">True</property>
+                            <property name="can_focus">True</property>
+                            <property name="receives_default">True</property>
+                            <property name="hexpand">True</property>
+                            <property name="vexpand">True</property>
+                            <property name="relief">none</property>
+                          </object>
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+                            <property name="expand">False</property>
+                            <property name="fill">True</property>
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+                      <object class="GtkBox">
+                        <property name="visible">True</property>
+                        <property name="can_focus">False</property>
+                        <property name="hexpand">True</property>
+                        <property name="vexpand">True</property>
+                        <property name="orientation">vertical</property>
+                        <child>
+                          <object class="GtkButton" id="cell29">
+                            <property name="label" translatable="yes"> </property>
+                            <property name="name">cell29</property>
+                            <property name="visible">True</property>
+                            <property name="can_focus">True</property>
+                            <property name="receives_default">True</property>
+                            <property name="hexpand">True</property>
+                            <property name="vexpand">True</property>
+                            <property name="relief">none</property>
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+                        <property name="orientation">vertical</property>
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+                        <property name="orientation">vertical</property>
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+                          <object class="GtkButton" id="cell78">
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+                            <property name="name">cell78</property>
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+                        <property name="orientation">vertical</property>
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+                          <object class="GtkButton" id="cell7">
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+                        <property name="orientation">vertical</property>
+                        <child>
+                          <object class="GtkButton" id="cell16">
+                            <property name="label" translatable="yes"> </property>
+                            <property name="name">cell16</property>
+                            <property name="visible">True</property>
+                            <property name="can_focus">True</property>
+                            <property name="receives_default">True</property>
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+                        <property name="orientation">vertical</property>
+                        <child>
+                          <object class="GtkButton" id="cell25">
+                            <property name="label" translatable="yes"> </property>
+                            <property name="name">cell25</property>
+                            <property name="visible">True</property>
+                            <property name="can_focus">True</property>
+                            <property name="receives_default">True</property>
+                            <property name="hexpand">True</property>
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+                            <property name="relief">none</property>
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+                        <property name="orientation">vertical</property>
+                        <child>
+                          <object class="GtkButton" id="cell8">
+                            <property name="label" translatable="yes"> </property>
+                            <property name="name">cell8</property>
+                            <property name="visible">True</property>
+                            <property name="can_focus">True</property>
+                            <property name="receives_default">True</property>
+                            <property name="hexpand">True</property>
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+                            <property name="relief">none</property>
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+                        <property name="orientation">vertical</property>
+                        <child>
+                          <object class="GtkButton" id="cell17">
+                            <property name="label" translatable="yes"> </property>
+                            <property name="name">cell17</property>
+                            <property name="visible">True</property>
+                            <property name="can_focus">True</property>
+                            <property name="receives_default">True</property>
+                            <property name="hexpand">True</property>
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+                        <property name="orientation">vertical</property>
+                        <child>
+                          <object class="GtkButton" id="cell26">
+                            <property name="label" translatable="yes"> </property>
+                            <property name="name">cell26</property>
+                            <property name="visible">True</property>
+                            <property name="can_focus">True</property>
+                            <property name="receives_default">True</property>
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+                        <property name="orientation">vertical</property>
+                        <child>
+                          <object class="GtkButton" id="cell9">
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+                            <property name="name">cell9</property>
+                            <property name="visible">True</property>
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+                            <property name="receives_default">True</property>
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+                        <property name="orientation">vertical</property>
+                        <child>
+                          <object class="GtkButton" id="cell18">
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+                            <property name="name">cell18</property>
+                            <property name="visible">True</property>
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+                        <property name="orientation">vertical</property>
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+                          <object class="GtkButton" id="cell27">
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+                            <property name="name">cell27</property>
+                            <property name="visible">True</property>
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+                        <property name="orientation">vertical</property>
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+                        <property name="orientation">vertical</property>
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+                        <property name="orientation">vertical</property>
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+                        <property name="orientation">vertical</property>
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+                          <object class="GtkButton" id="cell44">
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+                        <property name="orientation">vertical</property>
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+                        <property name="orientation">vertical</property>
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+                    <property name="visible">True</property>
+                    <property name="can_focus">False</property>
+                    <property name="hexpand">True</property>
+                    <property name="vexpand">True</property>
+                    <child>
+                      <object class="GtkBox">
+                        <property name="visible">True</property>
+                        <property name="can_focus">False</property>
+                        <property name="hexpand">True</property>
+                        <property name="vexpand">True</property>
+                        <property name="orientation">vertical</property>
+                        <child>
+                          <object class="GtkButton" id="cell61">
+                            <property name="label" translatable="yes"> </property>
+                            <property name="name">cell61</property>
+                            <property name="visible">True</property>
+                            <property name="can_focus">True</property>
+                            <property name="receives_default">True</property>
+                            <property name="hexpand">True</property>
+                            <property name="vexpand">True</property>
+                            <property name="relief">none</property>
+                          </object>
+                          <packing>
+                            <property name="expand">False</property>
+                            <property name="fill">True</property>
+                            <property name="position">0</property>
+                          </packing>
+                        </child>
+                      </object>
+                      <packing>
+                        <property name="left_attach">0</property>
+                        <property name="top_attach">0</property>
+                      </packing>
+                    </child>
+                    <child>
+                      <object class="GtkBox">
+                        <property name="visible">True</property>
+                        <property name="can_focus">False</property>
+                        <property name="hexpand">True</property>
+                        <property name="vexpand">True</property>
+                        <property name="orientation">vertical</property>
+                        <child>
+                          <object class="GtkButton" id="cell70">
+                            <property name="label" translatable="yes"> </property>
+                            <property name="name">cell70</property>
+                            <property name="visible">True</property>
+                            <property name="can_focus">True</property>
+                            <property name="receives_default">True</property>
+                            <property name="hexpand">True</property>
+                            <property name="vexpand">True</property>
+                            <property name="relief">none</property>
+                          </object>
+                          <packing>
+                            <property name="expand">False</property>
+                            <property name="fill">True</property>
+                            <property name="position">0</property>
+                          </packing>
+                        </child>
+                      </object>
+                      <packing>
+                        <property name="left_attach">0</property>
+                        <property name="top_attach">1</property>
+                      </packing>
+                    </child>
+                    <child>
+                      <object class="GtkBox">
+                        <property name="visible">True</property>
+                        <property name="can_focus">False</property>
+                        <property name="hexpand">True</property>
+                        <property name="vexpand">True</property>
+                        <property name="orientation">vertical</property>
+                        <child>
+                          <object class="GtkButton" id="cell79">
+                            <property name="label" translatable="yes"> </property>
+                            <property name="name">cell79</property>
+                            <property name="visible">True</property>
+                            <property name="can_focus">True</property>
+                            <property name="receives_default">True</property>
+                            <property name="hexpand">True</property>
+                            <property name="vexpand">True</property>
+                            <property name="relief">none</property>
+                          </object>
+                          <packing>
+                            <property name="expand">False</property>
+                            <property name="fill">True</property>
+                            <property name="position">0</property>
+                          </packing>
+                        </child>
+                      </object>
+                      <packing>
+                        <property name="left_attach">0</property>
+                        <property name="top_attach">2</property>
+                      </packing>
+                    </child>
+                    <child>
+                      <object class="GtkBox">
+                        <property name="visible">True</property>
+                        <property name="can_focus">False</property>
+                        <property name="hexpand">True</property>
+                        <property name="vexpand">True</property>
+                        <property name="orientation">vertical</property>
+                        <child>
+                          <object class="GtkButton" id="cell62">
+                            <property name="label" translatable="yes"> </property>
+                            <property name="name">cell62</property>
+                            <property name="visible">True</property>
+                            <property name="can_focus">True</property>
+                            <property name="receives_default">True</property>
+                            <property name="hexpand">True</property>
+                            <property name="vexpand">True</property>
+                            <property name="relief">none</property>
+                          </object>
+                          <packing>
+                            <property name="expand">False</property>
+                            <property name="fill">True</property>
+                            <property name="position">0</property>
+                          </packing>
+                        </child>
+                      </object>
+                      <packing>
+                        <property name="left_attach">1</property>
+                        <property name="top_attach">0</property>
+                      </packing>
+                    </child>
+                    <child>
+                      <object class="GtkBox">
+                        <property name="visible">True</property>
+                        <property name="can_focus">False</property>
+                        <property name="hexpand">True</property>
+                        <property name="vexpand">True</property>
+                        <property name="orientation">vertical</property>
+                        <child>
+                          <object class="GtkButton" id="cell71">
+                            <property name="label" translatable="yes"> </property>
+                            <property name="name">cell71</property>
+                            <property name="visible">True</property>
+                            <property name="can_focus">True</property>
+                            <property name="receives_default">True</property>
+                            <property name="hexpand">True</property>
+                            <property name="vexpand">True</property>
+                            <property name="relief">none</property>
+                          </object>
+                          <packing>
+                            <property name="expand">False</property>
+                            <property name="fill">True</property>
+                            <property name="position">0</property>
+                          </packing>
+                        </child>
+                      </object>
+                      <packing>
+                        <property name="left_attach">1</property>
+                        <property name="top_attach">1</property>
+                      </packing>
+                    </child>
+                    <child>
+                      <object class="GtkBox">
+                        <property name="visible">True</property>
+                        <property name="can_focus">False</property>
+                        <property name="hexpand">True</property>
+                        <property name="vexpand">True</property>
+                        <property name="orientation">vertical</property>
+                        <child>
+                          <object class="GtkButton" id="cell80">
+                            <property name="label" translatable="yes"> </property>
+                            <property name="name">cell80</property>
+                            <property name="visible">True</property>
+                            <property name="can_focus">True</property>
+                            <property name="receives_default">True</property>
+                            <property name="hexpand">True</property>
+                            <property name="vexpand">True</property>
+                            <property name="relief">none</property>
+                          </object>
+                          <packing>
+                            <property name="expand">False</property>
+                            <property name="fill">True</property>
+                            <property name="position">0</property>
+                          </packing>
+                        </child>
+                      </object>
+                      <packing>
+                        <property name="left_attach">1</property>
+                        <property name="top_attach">2</property>
+                      </packing>
+                    </child>
+                    <child>
+                      <object class="GtkBox">
+                        <property name="visible">True</property>
+                        <property name="can_focus">False</property>
+                        <property name="hexpand">True</property>
+                        <property name="vexpand">True</property>
+                        <property name="orientation">vertical</property>
+                        <child>
+                          <object class="GtkButton" id="cell63">
+                            <property name="label" translatable="yes"> </property>
+                            <property name="name">cell63</property>
+                            <property name="visible">True</property>
+                            <property name="can_focus">True</property>
+                            <property name="receives_default">True</property>
+                            <property name="hexpand">True</property>
+                            <property name="vexpand">True</property>
+                            <property name="relief">none</property>
+                          </object>
+                          <packing>
+                            <property name="expand">False</property>
+                            <property name="fill">True</property>
+                            <property name="position">0</property>
+                          </packing>
+                        </child>
+                      </object>
+                      <packing>
+                        <property name="left_attach">2</property>
+                        <property name="top_attach">0</property>
+                      </packing>
+                    </child>
+                    <child>
+                      <object class="GtkBox">
+                        <property name="visible">True</property>
+                        <property name="can_focus">False</property>
+                        <property name="hexpand">True</property>
+                        <property name="vexpand">True</property>
+                        <property name="orientation">vertical</property>
+                        <child>
+                          <object class="GtkButton" id="cell72">
+                            <property name="label" translatable="yes"> </property>
+                            <property name="name">cell72</property>
+                            <property name="visible">True</property>
+                            <property name="can_focus">True</property>
+                            <property name="receives_default">True</property>
+                            <property name="hexpand">True</property>
+                            <property name="vexpand">True</property>
+                            <property name="relief">none</property>
+                          </object>
+                          <packing>
+                            <property name="expand">False</property>
+                            <property name="fill">True</property>
+                            <property name="position">0</property>
+                          </packing>
+                        </child>
+                      </object>
+                      <packing>
+                        <property name="left_attach">2</property>
+                        <property name="top_attach">1</property>
+                      </packing>
+                    </child>
+                    <child>
+                      <object class="GtkBox">
+                        <property name="visible">True</property>
+                        <property name="can_focus">False</property>
+                        <property name="hexpand">True</property>
+                        <property name="vexpand">True</property>
+                        <property name="orientation">vertical</property>
+                        <child>
+                          <object class="GtkButton" id="cell81">
+                            <property name="label" translatable="yes"> </property>
+                            <property name="name">cell81</property>
+                            <property name="visible">True</property>
+                            <property name="can_focus">True</property>
+                            <property name="receives_default">True</property>
+                            <property name="hexpand">True</property>
+                            <property name="vexpand">True</property>
+                            <property name="relief">none</property>
+                          </object>
+                          <packing>
+                            <property name="expand">False</property>
+                            <property name="fill">True</property>
+                            <property name="position">0</property>
+                          </packing>
+                        </child>
+                      </object>
+                      <packing>
+                        <property name="left_attach">2</property>
+                        <property name="top_attach">2</property>
+                      </packing>
+                    </child>
+                  </object>
+                  <packing>
+                    <property name="left_attach">2</property>
+                    <property name="top_attach">2</property>
+                  </packing>
+                </child>
+              </object>
+              <packing>
+                <property name="expand">True</property>
+                <property name="fill">True</property>
+                <property name="position">0</property>
+              </packing>
+            </child>
+            <child>
+              <object class="GtkGrid">
+                <property name="name">statusBar</property>
+                <property name="visible">True</property>
+                <property name="can_focus">False</property>
+                <property name="row_spacing">20</property>
+                <property name="row_homogeneous">True</property>
+                <property name="column_homogeneous">True</property>
+                <child>
+                  <object class="GtkButton" id="menuButton">
+                    <property name="label" translatable="yes">Abort</property>
+                    <property name="visible">True</property>
+                    <property name="can_focus">True</property>
+                    <property name="receives_default">True</property>
+                  </object>
+                  <packing>
+                    <property name="left_attach">0</property>
+                    <property name="top_attach">0</property>
+                  </packing>
+                </child>
+                <child>
+                  <object class="GtkButton" id="solveButton">
+                    <property name="label" translatable="yes">Cheat</property>
+                    <property name="visible">True</property>
+                    <property name="can_focus">True</property>
+                    <property name="receives_default">True</property>
+                  </object>
+                  <packing>
+                    <property name="left_attach">1</property>
+                    <property name="top_attach">0</property>
+                  </packing>
+                </child>
+                <child>
+                  <object class="GtkButton" id="checkButton">
+                    <property name="label" translatable="yes">Check</property>
+                    <property name="visible">True</property>
+                    <property name="can_focus">True</property>
+                    <property name="receives_default">True</property>
+                  </object>
+                  <packing>
+                    <property name="left_attach">2</property>
+                    <property name="top_attach">0</property>
+                  </packing>
+                </child>
+              </object>
+              <packing>
+                <property name="expand">False</property>
+                <property name="fill">True</property>
+                <property name="position">1</property>
+              </packing>
+            </child>
+          </object>
+          <packing>
+            <property name="index">-1</property>
+          </packing>
+        </child>
+        <child type="overlay">
+          <object class="GtkOverlay" id="menu">
+            <property name="name">menu</property>
+            <property name="visible">True</property>
+            <property name="can_focus">False</property>
+            <child>
+              <object class="GtkBox">
+                <property name="name">backdrop</property>
+                <property name="visible">True</property>
+                <property name="can_focus">False</property>
+                <property name="hexpand">True</property>
+                <property name="vexpand">True</property>
+                <property name="orientation">vertical</property>
+                <child>
+                  <placeholder/>
+                </child>
+              </object>
+              <packing>
+                <property name="index">-1</property>
+              </packing>
+            </child>
+            <child type="overlay">
+              <object class="GtkBox">
+                <property name="name">menu-text</property>
+                <property name="visible">True</property>
+                <property name="can_focus">False</property>
+                <property name="hexpand">True</property>
+                <property name="vexpand">True</property>
+                <property name="orientation">vertical</property>
+                <child>
+                  <object class="GtkLabel">
+                    <property name="name">title</property>
+                    <property name="visible">True</property>
+                    <property name="can_focus">False</property>
+                    <property name="label" translatable="yes">λsudoku</property>
+                  </object>
+                  <packing>
+                    <property name="expand">False</property>
+                    <property name="fill">True</property>
+                    <property name="position">0</property>
+                  </packing>
+                </child>
+                <child>
+                  <object class="GtkLabel">
+                    <property name="name">copyright</property>
+                    <property name="visible">True</property>
+                    <property name="can_focus">False</property>
+                    <property name="label" translatable="yes">© Marcel Moosbrugger, 2017</property>
+                    <style>
+                      <class name="light"/>
+                    </style>
+                  </object>
+                  <packing>
+                    <property name="expand">False</property>
+                    <property name="fill">True</property>
+                    <property name="position">1</property>
+                  </packing>
+                </child>
+                <child>
+                  <object class="GtkLabel">
+                    <property name="visible">True</property>
+                    <property name="can_focus">False</property>
+                    <property name="label" translatable="yes">New game:</property>
+                    <style>
+                      <class name="light"/>
+                    </style>
+                  </object>
+                  <packing>
+                    <property name="expand">False</property>
+                    <property name="fill">True</property>
+                    <property name="position">2</property>
+                  </packing>
+                </child>
+                <child>
+                  <object class="GtkGrid">
+                    <property name="visible">True</property>
+                    <property name="can_focus">False</property>
+                    <property name="hexpand">True</property>
+                    <property name="vexpand">False</property>
+                    <property name="row_spacing">10</property>
+                    <property name="column_spacing">10</property>
+                    <property name="row_homogeneous">True</property>
+                    <property name="column_homogeneous">True</property>
+                    <child>
+                      <object class="GtkButton" id="gameEasy">
+                        <property name="label" translatable="yes">Easy</property>
+                        <property name="visible">True</property>
+                        <property name="can_focus">True</property>
+                        <property name="has_focus">True</property>
+                        <property name="receives_default">True</property>
+                      </object>
+                      <packing>
+                        <property name="left_attach">0</property>
+                        <property name="top_attach">0</property>
+                      </packing>
+                    </child>
+                    <child>
+                      <object class="GtkButton" id="gameMedium">
+                        <property name="label" translatable="yes">Medium</property>
+                        <property name="visible">True</property>
+                        <property name="can_focus">True</property>
+                        <property name="receives_default">True</property>
+                      </object>
+                      <packing>
+                        <property name="left_attach">1</property>
+                        <property name="top_attach">0</property>
+                      </packing>
+                    </child>
+                    <child>
+                      <object class="GtkButton" id="gameHard">
+                        <property name="label" translatable="yes">Hard</property>
+                        <property name="visible">True</property>
+                        <property name="can_focus">True</property>
+                        <property name="receives_default">True</property>
+                      </object>
+                      <packing>
+                        <property name="left_attach">2</property>
+                        <property name="top_attach">0</property>
+                      </packing>
+                    </child>
+                    <child>
+                      <object class="GtkButton" id="gameEvil">
+                        <property name="label" translatable="yes">Evil</property>
+                        <property name="visible">True</property>
+                        <property name="can_focus">True</property>
+                        <property name="receives_default">True</property>
+                      </object>
+                      <packing>
+                        <property name="left_attach">3</property>
+                        <property name="top_attach">0</property>
+                      </packing>
+                    </child>
+                  </object>
+                  <packing>
+                    <property name="expand">False</property>
+                    <property name="fill">True</property>
+                    <property name="position">3</property>
+                  </packing>
+                </child>
+                <child>
+                  <placeholder/>
+                </child>
+              </object>
+            </child>
+          </object>
+        </child>
+      </object>
+    </child>
+  </object>
+</interface>
diff --git a/gui/icon.png b/gui/icon.png
new file mode 100644
Binary files /dev/null and b/gui/icon.png differ
diff --git a/gui/theme.css b/gui/theme.css
new file mode 100644
--- /dev/null
+++ b/gui/theme.css
@@ -0,0 +1,131 @@
+#mainWindow {
+    background: #ECF0F1;
+}
+
+#container {
+    padding: 15px;
+}
+
+#menu #backdrop {
+    background: #2C3E50;
+    opacity: 0.8;
+}
+
+#menu #title {
+    font-size: 58px;
+    margin-top: 50px;
+    margin-bottom: 5px;
+    color: #E74C3C;
+    text-shadow: 0px 0px 5px #2C3E50;
+}
+
+#menu .light {
+    color: #ECF0F1;
+    font-size: 10px;
+    margin-bottom: 10px;
+}
+
+#menu #copyright {
+    margin-bottom: 125px;
+}
+
+#menu #menu-text {
+    padding: 20px;
+}
+
+#mainGrid {
+    border: 2px solid #999;
+}
+
+#mainGrid > grid:nth-child(2n+1) {
+    background: #E1E5E5;
+}
+
+#mainGrid > grid:nth-child(4),
+#mainGrid > grid:nth-child(5),
+#mainGrid > grid:nth-child(6) {
+    border-style: solid;
+    border-color: #999;
+    border-left-width: 2px;
+    border-right-width: 2px;
+}
+
+
+#mainGrid > grid:nth-child(2),
+#mainGrid > grid:nth-child(5),
+#mainGrid > grid:nth-child(8) {
+    border-style: solid;
+    border-color: #999;
+    border-top-width: 2px;
+    border-bottom-width: 2px;
+}
+
+#mainGrid > grid > *:nth-child(4) ,
+#mainGrid > grid > *:nth-child(5) ,
+#mainGrid > grid > *:nth-child(6) {
+    border-style: solid;
+    border-color: #bbb;
+    border-left-width: 1px;
+    border-right-width: 1px;
+}
+
+#mainGrid > grid > *:nth-child(2),
+#mainGrid > grid > *:nth-child(5),
+#mainGrid > grid > *:nth-child(8) {
+    border-style: solid;
+    border-color: #bbb;
+    border-top-width: 1px;
+    border-bottom-width: 1px;
+}
+
+#mainGrid box label {
+    min-width: 60px;
+    min-height: 60px;
+    font-size: 18px;
+}
+
+#mainGrid button {
+    border-radius: 0;
+    border: 0;
+    background: transparent;
+}
+
+#mainGrid button:hover {
+    background: #3498DB;
+}
+
+#mainGrid button:active {
+    background: #2980B9;
+}
+
+#mainGrid button:focus {
+    background: #E74C3C;
+}
+
+#mainGrid button.correct {
+    animation: correct 0.75s ease-out;
+}
+
+#mainGrid button.incorrect {
+    animation: incorrect 0.75s ease-out;
+}
+
+#inputPopover grid button {
+    min-width: 20px;
+    min-height: 20px;
+}
+
+#statusBar {
+    padding-top: 15px;
+}
+
+
+@keyframes correct {
+    0%   {background-color: #6AE765;}
+    100% {background-color: transparent;}
+}
+
+@keyframes incorrect {
+    0%   {background-color: #E74C3C;}
+    100% {background-color: transparent;}
+}
diff --git a/hsudoku.cabal b/hsudoku.cabal
--- a/hsudoku.cabal
+++ b/hsudoku.cabal
@@ -1,5 +1,5 @@
 name:               hsudoku
-version:            0.1.0.0
+version:            0.1.0.1
 synopsis:           Sudoku game with a GTK3 interface
 description:        This package realizes a graphical GTK3 sudoku game. Moreover it
                     provides modules for loading and solving sudoku grids.
@@ -13,7 +13,12 @@
 bug-reports:        https://github.com/marcelmoosbrugger/hsudoku/issues
 build-type:         Simple
 cabal-version:      >=1.10
+Tested-with:        GHC == 8.0.2
 
+extra-source-files: gui/hsudoku.ui
+                    gui/icon.png,
+                    gui/theme.css
+
 source-repository head
     type:           git
     location:       git@github.com:marcelmoosbrugger/hsudoku.git   
@@ -73,12 +78,42 @@
                       , hxt>=9.3 && <9.4
                       , haskell-gi-base>=0.20 && <0.21
                       , gi-gtk>=3.0 && <3.1
-                      , hspec>=2.4 && <2.5
+                      , hspec>=2.2 && <2.5
                       , QuickCheck>=2.9 && <2.10
                       , hsudoku
 
   other-modules:        UtilSpec
                       , UserInterfaceSpec
+                      , Sudoku.TypeSpec
+                      , Sudoku.SolverSpec
+                      , Sudoku.LoaderSpec
+                      , TestData
+
+  default-language:    Haskell2010
+  default-extensions:  OverloadedStrings, OverloadedLabels
+
+-- Travis does not support ubuntu 16.04 yet and therefore
+-- GTK+ 3.20 cannot be installed. As the user interface
+-- uses new features from GTK+ 3.20, these cannot be tested on travis
+test-suite travis
+   type:                exitcode-stdio-1.0
+   ghc-options:         -Wall
+   main-is:             Travis.hs
+   hs-source-dirs:      test
+   build-depends:       base >=4.9 && <4.10
+                      , text >=1.2 && <1.3
+                      , bytestring>=0.10 && <0.11
+                      , http-client>=0.5 && <0.6
+                      , http-client-tls>= 0.3 && <0.4
+                      , HandsomeSoup>=0.4 && <0.5
+                      , hxt>=9.3 && <9.4
+                      , haskell-gi-base>=0.20 && <0.21
+                      , gi-gtk>=3.0 && <3.1
+                      , hspec>=2.2 && <2.5
+                      , QuickCheck>=2.9 && <2.10
+                      , hsudoku
+
+  other-modules:        UtilSpec
                       , Sudoku.TypeSpec
                       , Sudoku.SolverSpec
                       , Sudoku.LoaderSpec
diff --git a/test/Travis.hs b/test/Travis.hs
new file mode 100644
--- /dev/null
+++ b/test/Travis.hs
@@ -0,0 +1,20 @@
+-- Travis does not support ubuntu 16.04 yet and therefore
+-- GTK+ 3.20 cannot be installed. As the user interface
+-- uses new features from GTK+ 3.20, these cannot be tested on travis
+import           Test.Hspec
+
+import qualified Sudoku.LoaderSpec
+import qualified Sudoku.SolverSpec
+import qualified Sudoku.TypeSpec
+import qualified UtilSpec
+
+main :: IO ()
+main = hspec spec
+
+spec :: Spec
+spec = do
+    describe "UtilSpec"          UtilSpec.spec
+    describe "Sudoku.LoaderSpec" Sudoku.LoaderSpec.spec
+    describe "Sudoku.SolverSpec" Sudoku.SolverSpec.spec
+    describe "Sudoku.TypeSpec"   Sudoku.TypeSpec.spec
+
