diff --git a/app/app.iml b/app/app.iml
index f33ee01..74d7e06 100644
--- a/app/app.iml
+++ b/app/app.iml
@@ -9,14 +9,15 @@
     <facet type="android" name="Android">
       <configuration>
         <option name="SELECTED_BUILD_VARIANT" value="debug" />
-        <option name="SELECTED_TEST_ARTIFACT" value="_android_test_" />
+        <option name="SELECTED_TEST_ARTIFACT" value="_unit_test_" />
         <option name="ASSEMBLE_TASK_NAME" value="assembleDebug" />
         <option name="COMPILE_JAVA_TASK_NAME" value="compileDebugSources" />
-        <option name="ASSEMBLE_TEST_TASK_NAME" value="assembleDebugAndroidTest" />
-        <option name="COMPILE_JAVA_TEST_TASK_NAME" value="compileDebugAndroidTestSources" />
+        <option name="ASSEMBLE_TEST_TASK_NAME" value="assembleDebugUnitTest" />
+        <option name="COMPILE_JAVA_TEST_TASK_NAME" value="compileDebugUnitTestSources" />
         <afterSyncTasks>
-          <task>generateDebugAndroidTestSources</task>
           <task>generateDebugSources</task>
+          <task>mockableAndroidJar</task>
+          <task>prepareDebugUnitTestDependencies</task>
         </afterSyncTasks>
         <option name="ALLOW_USER_CONFIGURATION" value="false" />
         <option name="MANIFEST_FILE_RELATIVE_PATH" value="/src/main/AndroidManifest.xml" />
@@ -28,7 +29,7 @@
   </component>
   <component name="NewModuleRootManager" LANGUAGE_LEVEL="JDK_1_7" inherit-compiler-output="false">
     <output url="file://$MODULE_DIR$/build/intermediates/classes/debug" />
-    <output-test url="file://$MODULE_DIR$/build/intermediates/classes/androidTest/debug" />
+    <output-test url="file://$MODULE_DIR$/build/intermediates/classes/test/debug" />
     <exclude-output />
     <content url="file://$MODULE_DIR$">
       <sourceFolder url="file://$MODULE_DIR$/build/generated/source/r/debug" isTestSource="false" generated="true" />
@@ -37,12 +38,6 @@
       <sourceFolder url="file://$MODULE_DIR$/build/generated/source/rs/debug" isTestSource="false" generated="true" />
       <sourceFolder url="file://$MODULE_DIR$/build/generated/res/rs/debug" type="java-resource" />
       <sourceFolder url="file://$MODULE_DIR$/build/generated/res/resValues/debug" type="java-resource" />
-      <sourceFolder url="file://$MODULE_DIR$/build/generated/source/r/androidTest/debug" isTestSource="true" generated="true" />
-      <sourceFolder url="file://$MODULE_DIR$/build/generated/source/aidl/androidTest/debug" isTestSource="true" generated="true" />
-      <sourceFolder url="file://$MODULE_DIR$/build/generated/source/buildConfig/androidTest/debug" isTestSource="true" generated="true" />
-      <sourceFolder url="file://$MODULE_DIR$/build/generated/source/rs/androidTest/debug" isTestSource="true" generated="true" />
-      <sourceFolder url="file://$MODULE_DIR$/build/generated/res/rs/androidTest/debug" type="java-test-resource" />
-      <sourceFolder url="file://$MODULE_DIR$/build/generated/res/resValues/androidTest/debug" type="java-test-resource" />
       <sourceFolder url="file://$MODULE_DIR$/src/debug/res" type="java-resource" />
       <sourceFolder url="file://$MODULE_DIR$/src/debug/resources" type="java-resource" />
       <sourceFolder url="file://$MODULE_DIR$/src/debug/assets" type="java-resource" />
@@ -50,6 +45,13 @@
       <sourceFolder url="file://$MODULE_DIR$/src/debug/java" isTestSource="false" />
       <sourceFolder url="file://$MODULE_DIR$/src/debug/jni" isTestSource="false" />
       <sourceFolder url="file://$MODULE_DIR$/src/debug/rs" isTestSource="false" />
+      <sourceFolder url="file://$MODULE_DIR$/src/testDebug/res" type="java-test-resource" />
+      <sourceFolder url="file://$MODULE_DIR$/src/testDebug/resources" type="java-test-resource" />
+      <sourceFolder url="file://$MODULE_DIR$/src/testDebug/assets" type="java-test-resource" />
+      <sourceFolder url="file://$MODULE_DIR$/src/testDebug/aidl" isTestSource="true" />
+      <sourceFolder url="file://$MODULE_DIR$/src/testDebug/java" isTestSource="true" />
+      <sourceFolder url="file://$MODULE_DIR$/src/testDebug/jni" isTestSource="true" />
+      <sourceFolder url="file://$MODULE_DIR$/src/testDebug/rs" isTestSource="true" />
       <sourceFolder url="file://$MODULE_DIR$/src/main/res" type="java-resource" />
       <sourceFolder url="file://$MODULE_DIR$/src/main/resources" type="java-resource" />
       <sourceFolder url="file://$MODULE_DIR$/src/main/assets" type="java-resource" />
@@ -57,13 +59,13 @@
       <sourceFolder url="file://$MODULE_DIR$/src/main/java" isTestSource="false" />
       <sourceFolder url="file://$MODULE_DIR$/src/main/jni" isTestSource="false" />
       <sourceFolder url="file://$MODULE_DIR$/src/main/rs" isTestSource="false" />
-      <sourceFolder url="file://$MODULE_DIR$/src/androidTest/res" type="java-test-resource" />
-      <sourceFolder url="file://$MODULE_DIR$/src/androidTest/resources" type="java-test-resource" />
-      <sourceFolder url="file://$MODULE_DIR$/src/androidTest/assets" type="java-test-resource" />
-      <sourceFolder url="file://$MODULE_DIR$/src/androidTest/aidl" isTestSource="true" />
-      <sourceFolder url="file://$MODULE_DIR$/src/androidTest/java" isTestSource="true" />
-      <sourceFolder url="file://$MODULE_DIR$/src/androidTest/jni" isTestSource="true" />
-      <sourceFolder url="file://$MODULE_DIR$/src/androidTest/rs" isTestSource="true" />
+      <sourceFolder url="file://$MODULE_DIR$/src/test/res" type="java-test-resource" />
+      <sourceFolder url="file://$MODULE_DIR$/src/test/resources" type="java-test-resource" />
+      <sourceFolder url="file://$MODULE_DIR$/src/test/assets" type="java-test-resource" />
+      <sourceFolder url="file://$MODULE_DIR$/src/test/aidl" isTestSource="true" />
+      <sourceFolder url="file://$MODULE_DIR$/src/test/java" isTestSource="true" />
+      <sourceFolder url="file://$MODULE_DIR$/src/test/jni" isTestSource="true" />
+      <sourceFolder url="file://$MODULE_DIR$/src/test/rs" isTestSource="true" />
       <excludeFolder url="file://$MODULE_DIR$/build/intermediates/assets" />
       <excludeFolder url="file://$MODULE_DIR$/build/intermediates/bundles" />
       <excludeFolder url="file://$MODULE_DIR$/build/intermediates/classes" />
@@ -93,6 +95,8 @@
     <orderEntry type="jdk" jdkName="Android API 23 Platform" jdkType="Android SDK" />
     <orderEntry type="sourceFolder" forTests="false" />
     <orderEntry type="library" exported="" name="recyclerview-v7-23.1.0" level="project" />
+    <orderEntry type="library" exported="" scope="TEST" name="hamcrest-core-1.3" level="project" />
+    <orderEntry type="library" exported="" scope="TEST" name="junit-4.12" level="project" />
     <orderEntry type="library" exported="" name="support-v4-23.1.0" level="project" />
     <orderEntry type="library" exported="" name="design-23.1.0" level="project" />
     <orderEntry type="library" exported="" name="appcompat-v7-23.1.0" level="project" />
diff --git a/app/src/main/AndroidManifest.xml b/app/src/main/AndroidManifest.xml
index 4a98da3..2948c5e 100644
--- a/app/src/main/AndroidManifest.xml
+++ b/app/src/main/AndroidManifest.xml
@@ -8,13 +8,21 @@
         android:label="@string/app_name"
         android:supportsRtl="true"
         android:theme="@style/AppTheme" >
-        <activity
-            android:name=".view.MainMenu"
+        <!--<activity
+            android:name=".MainMenu"
+            android:label="@string/app_name"
+            android:theme="@style/AppTheme.NoActionBar" >
+            <intent-filter>
+                <action android:name="android.intent.action.MAIN" />
+                <category android:name="android.intent.category.LAUNCHER" />
+            </intent-filter>
+        </activity>-->
+        <activity
+            android:name=".GameView"
             android:label="@string/app_name"
             android:theme="@style/AppTheme.NoActionBar" >
             <intent-filter>
                 <action android:name="android.intent.action.MAIN" />
-
                 <category android:name="android.intent.category.LAUNCHER" />
             </intent-filter>
         </activity>
diff --git a/app/src/main/java/tu_darmstadt/sudoku/controller/GameController.java b/app/src/main/java/tu_darmstadt/sudoku/controller/GameController.java
index b042be9..5d17cbe 100644
--- a/app/src/main/java/tu_darmstadt/sudoku/controller/GameController.java
+++ b/app/src/main/java/tu_darmstadt/sudoku/controller/GameController.java
@@ -1,6 +1,8 @@
 package tu_darmstadt.sudoku.controller;
 
 import tu_darmstadt.sudoku.game.*;
+
+import java.util.LinkedList;
 import java.util.List;
 import java.util.ArrayList;
 
@@ -11,22 +13,47 @@ public class GameController {
 
     private int size;
     private GameField gameField;
-    private List<CheckError> errorList = new ArrayList<CheckError>();
+    private ArrayList<CheckError> errorList = new ArrayList<CheckError>();
+    private GameSettings settings = new GameSettings();
 
 //    private SudokuSolver solver;
 //    private SudokuGenerator generator;
 
-
-    public GameController(int size) {
-        this.size = size;
-        gameField = new GameField(size);
+    public GameController() {
+        this(GameType.Default_9x9);
     }
 
-    public void setValue(int row, int col, int val) {
+    public GameController(GameType type) {
+        gameField = new GameField(type);
+        size = gameField.getSize();
+    }
+
+    /*public boolean loadLevel(GameField level) {
+        if(GameField.isValid(level)) {
+            gameField = level;
+        }
+    }*/
+
+    public void setValue(int row, int col, int value) {
         GameCell cell = gameField.getCell(row, col);
-        if (!cell.isFixed() && isValidNumber(val)) {
-            cell.clearNotes();
-            cell.setValue(val);
+        if (!cell.isFixed() && isValidNumber(value)) {
+            cell.deleteNotes();
+            cell.setValue(value);
+
+            if(settings.getEnableAutomaticNoteDeletion()) {
+                LinkedList<GameCell> updateList = new LinkedList<GameCell>();
+                updateList.addAll(gameField.getRow(cell.getRow()));
+                updateList.addAll(gameField.getColumn(cell.getCol()));
+                updateList.addAll(gameField.getSection(cell.getRow(), cell.getCol()));
+                deleteNote(updateList, value);
+            }
+
+        }
+    }
+
+    public void deleteNote(List<GameCell> updateList, int value) {
+        for(GameCell c : updateList) {
+            c.deleteNote(value);
         }
     }
 
@@ -51,42 +78,84 @@ public class GameController {
 
     public boolean isSolved() {
         boolean solved = true;
-        /*
+
+        // this will automatically build the CheckError list. so we reset it before we call the checks
+        errorList = new ArrayList<CheckError>();
+
         for(int i = 0; i < size; i++) {
-
-            List<Integer> set = new ArrayList<Integer>();
-            for(int j = 0; j < size; j++) {
-                if(set.contains(gameField.getField()[i][j].getValue())) {
-                    errorList.add(new CheckError(i,j,));
-                } else {
-                    set.add(gameField.getField()[i][j].getValue());
-                }
-            }
-
-            if(!checkList() solved = false;
+            if(!checkList(gameField.getRow(i))) solved = false;
             if(!checkList(gameField.getColumn(i))) solved = false;
             if(!checkList(gameField.getSection(i))) solved = false;
-        }*/
+        }
         return solved;
     }
 
     /**
      * Checks the given list if every number occurs only once.
+     * This method will automatically build the errorList.
      * @param list the list of {@link GameCell}s that is supposed to be tested.
      * @return true if every cell has a value and every value occurs only once
      */
-    private boolean checkList(GameCell[] list) {
-        /*List<Integer> set = new ArrayList<Integer>();
-        for(GameCell c : list) {
-            if(set.contains(c.getValue())) {
+    private boolean checkList(List<GameCell> list) {
+        boolean isNothingEmpty = true;
+        CheckError lastFound = null;
 
-                errorList.add(new CheckError());
+        for(int i = 0; i < list.size(); i++) {
+            for(int j = i + 1; j < list.size(); j++) {
+                GameCell c1 = list.get(i);
+                GameCell c2 = list.get(j);
+
+                if(c1.getValue() == 0 || c2.getValue() == 0) {
+                    isNothingEmpty = false;
+                }
+
+                // Same value in one set should not exist
+                if(c1.getValue() != 0 && c1.getValue() == c2.getValue()) {
+                    // we found an error..
+
+                    LinkedList<CheckError> removeList = new LinkedList<CheckError>();
+
+                    // check if one of the cells is already in conflict with something else
+                    if(errorList.size() == 0) {
+                        lastFound = new CheckError(c1, c2);
+                        errorList.add(lastFound);
+                    }
+                    for(CheckError ce : errorList) {
+                        if(ce.contains(c1) || ce.contains(c2)) {
+                            ce.add(c1);
+                            ce.add(c2);
+
+                            if(lastFound != null && !lastFound.equals(ce)) {
+                                lastFound.merge(ce);
+                                removeList.add(ce);
+                            } else {
+                                lastFound = ce;
+                            }
+                        } else {
+                            lastFound = new CheckError(c1, c2);
+                            errorList.add(lastFound);
+                        }
+                    }
+
+                    // remove the empty errors, that have been merged.
+                    for(CheckError ce : removeList) {
+                        errorList.remove(ce);
+                    }
+                }
             }
-        }*/
-        return false;
+        }
+        return isNothingEmpty ? (errorList.size() == 0) : false;
     }
 
     public List<CheckError> getErrorList() {
         return errorList;
     }
+
+    /** Debug only method
+     *
+     * @return the Field represented as a String
+     */
+    public String getFieldAsString() {
+        return gameField.toString();
+    }
 }
diff --git a/app/src/main/java/tu_darmstadt/sudoku/game/CheckError.java b/app/src/main/java/tu_darmstadt/sudoku/game/CheckError.java
index 61c18e7..1eeb7fb 100644
--- a/app/src/main/java/tu_darmstadt/sudoku/game/CheckError.java
+++ b/app/src/main/java/tu_darmstadt/sudoku/game/CheckError.java
@@ -1,13 +1,78 @@
 package tu_darmstadt.sudoku.game;
 
+import java.util.LinkedList;
+
 /**
  * Created by Chris on 08.11.2015.
  */
 public class CheckError {
 
+    /*
+     * An Error is created for every cell.
+     */
 
+    private int value = 0;
+    private LinkedList<GameCell> list = new LinkedList<GameCell>();
 
-    CheckError(GameCell first, GameCell... list) {
+    public CheckError(GameCell first, GameCell second) {
+        add(first);
+        add(second);
+    }
 
+    public void add(GameCell cell) {
+        if(value == 0 && cell.getValue() != 0) {
+            value = cell.getValue();
+        }
+
+        if(!list.contains(cell)) {
+            list.add(cell);
+        }
+    }
+
+    public boolean contains(GameCell c) {
+        return list.contains(c);
+    }
+
+    public void merge(CheckError other) {
+        // merge the same object? ... why would you do that. This would simply clear the CheckError.
+        if(equals(other)) return;
+
+        for(GameCell c : other.list) {
+            if(!contains(c)) {
+                add(c);
+            }
+        }
+        // Empty the other list.... because they are merged now.
+        other.list = new LinkedList<GameCell>();
+    }
+
+    @Override
+    public boolean equals(Object other) {
+        if(!(other instanceof CheckError)) {
+            return false;
+        }
+        if(list.size() != ((CheckError) other).list.size()) return false;
+
+        for(int i = 0; i < list.size(); i++) {
+            if(!list.get(i).equals(((CheckError) other).list.get(i))) {
+                return false;
+            }
+        }
+        return true;
+    }
+
+    @Override
+    public String toString() {
+        StringBuilder sb = new StringBuilder();
+        sb.append("[CheckError: "); sb.append(value);
+        for(GameCell c : list) {
+            sb.append(" (");
+            sb.append(c.getRow());
+            sb.append("|");
+            sb.append(c.getCol());
+            sb.append(")");
+        }
+        sb.append("]");
+        return sb.toString();
     }
 }
diff --git a/app/src/main/java/tu_darmstadt/sudoku/game/GameCell.java b/app/src/main/java/tu_darmstadt/sudoku/game/GameCell.java
index 48dd8f6..ef2df5b 100644
--- a/app/src/main/java/tu_darmstadt/sudoku/game/GameCell.java
+++ b/app/src/main/java/tu_darmstadt/sudoku/game/GameCell.java
@@ -5,8 +5,8 @@ package tu_darmstadt.sudoku.game;
  */
 public class GameCell {
 
-    private int row = -1;
-    private int col = -1;
+    private int row = 0;
+    private int col = 0;
     private int value = 0;
     private boolean fixed = false;
     private boolean notes[];
@@ -24,14 +24,12 @@ public class GameCell {
         this.row = row;
         this.col = col;
         this.size = size;
-        clearNotes();
         if(0 < val && val <= size) {
             setValue(val);
             setFixed(true);
         } else {
             setValue(0);
             setFixed(false);
-
         }
     }
 
@@ -40,7 +38,7 @@ public class GameCell {
      * @param val the value to be assigned to the cell.
      */
     public void setValue(int val) {
-        clearNotes();
+        deleteNotes();
         value = val;
     }
 
@@ -60,10 +58,19 @@ public class GameCell {
      * Toggle notes in this cell, if cell isn't fixed.
      * @param val the value to be toggled.
      */
-    public void setNotes(int val) {
-        // only possible to set notes if cell isn't fixed.
-        // TODO .. put logic here?
-        notes[val - 1] = !notes[val - 1];
+    public void toggleNote(int val) {
+        if(!isFixed())
+            notes[val - 1] = !notes[val - 1];
+    }
+
+    public void setNote(int val) {
+        if(!isFixed())
+            notes[val - 1] = true;
+    }
+
+    public void deleteNote(int val) {
+        if(!isFixed())
+            notes[val - 1] = false;
     }
 
     public boolean[] getNotes() {
@@ -73,7 +80,7 @@ public class GameCell {
     /**
      * Clear the notes array (set everything to false).
      */
-    public void clearNotes() {
+    public void deleteNotes() {
         notes = new boolean[size];
     }
 
@@ -81,7 +88,47 @@ public class GameCell {
         return fixed;
     }
 
-    public void setFixed(boolean b) {
+    private void setFixed(boolean b) {
         fixed = b;
     }
+
+    @Override
+    public boolean equals(Object other) {
+        if(!(other instanceof GameCell)) return false;
+        if(((GameCell) other).getCol() != this.getCol()) return false;
+        if(((GameCell) other).getRow() != this.getRow()) return false;
+        if(((GameCell) other).isFixed() != this.isFixed()) return false;
+        if(((GameCell) other).getValue() != this.getValue()) return false;
+        if(((GameCell) other).getNotes().length != this.getNotes().length) return false;
+        for(int i = 0; i < notes.length; i++) {
+            if(((GameCell) other).getNotes()[i] != this.getNotes()[i]) return false;
+        }
+        return true;
+    }
+
+    @Override
+    public String toString() {
+        StringBuilder sb = new StringBuilder();
+        sb.append("{("); sb.append(row); sb.append("|"); sb.append(col); sb.append(")");
+        sb.append(" ");
+        if(value == 0) {
+            sb.append("[");
+            boolean addedNotes = false;
+            for(int i = 0; i < size; i++) {
+                if(notes[i]) {
+                    if(addedNotes) {
+                        sb.append(" ,");
+                    }
+                    sb.append(i+1);
+                    addedNotes = true;
+                }
+            }
+            sb.append("]");
+        } else {
+            sb.append(value);
+        }
+        sb.append("}");
+
+        return sb.toString();
+    }
 }
diff --git a/app/src/main/java/tu_darmstadt/sudoku/game/GameField.java b/app/src/main/java/tu_darmstadt/sudoku/game/GameField.java
index 196f396..bf3b09d 100644
--- a/app/src/main/java/tu_darmstadt/sudoku/game/GameField.java
+++ b/app/src/main/java/tu_darmstadt/sudoku/game/GameField.java
@@ -1,21 +1,27 @@
 package tu_darmstadt.sudoku.game;
 
+import java.util.LinkedList;
+
 /**
- * Created by Chris on 06.11.2015.
+ * Created by Christopher Beckmann on 06.11.2015.
  */
 public class GameField {
 
+    //private int id;
+    private int sectionHeight;
+    private int sectionWidth;
+    //private List additionalSections
     private int size;
     private GameCell[][] field;
 
     public GameField() {
-        this(9);
+        this(GameType.Default_9x9);
     }
 
-    public GameField(int size) {
-        this.size = size;
-        field = new GameCell[size][size];
+    public GameField(GameType type) {
+        setGameType(type);
 
+        field = new GameCell[size][size];
 
 
         // TODO: this is a placeholder, because we don't have real levels yet.
@@ -34,6 +40,19 @@ public class GameField {
         initCells(level);
     }
 
+    private void setGameType(GameType type) {
+        switch(type) {
+            case Default_9x9:
+                this.size = 9;
+                this.sectionHeight = 3;
+                this.sectionWidth = 3;
+                break;
+            case Unspecified:
+            default:
+                throw new IllegalArgumentException("GameType can not be unspecified.");
+        }
+    }
+
     public void initCells(int[][] level) {
         // Initit the game field
         for(int i = 0; i < size; i++) {
@@ -51,31 +70,34 @@ public class GameField {
         return field;
     }
 
-    public GameCell[] getRow(int row) {
-        return field[row];
+    public LinkedList<GameCell> getRow(int row) {
+        LinkedList<GameCell> result = new LinkedList<GameCell>();
+        for(GameCell c : field[row]) {
+            result.add(c);
+        }
+        return result;
     }
 
-    public GameCell[] getColumn(int col) {
-        GameCell[] result = new GameCell[size];
+    public LinkedList<GameCell> getColumn(int col) {
+        LinkedList<GameCell> result = new LinkedList<GameCell>();
         for(int i = 0; i < size ; i++) {    // row
             for(int j = 0 ; j < size ; j++) {   // col
                 if(j == col) {
-                    result[i] = field[i][j];
+                    result.add(field[i][j]);
                 }
             }
         }
         return result;
     }
 
-    public GameCell[] getSection(int sec) {
-        GameCell[] result = new GameCell[size];
-        int c = 0;
+    public LinkedList<GameCell> getSection(int sec) {
+        LinkedList<GameCell> result = new LinkedList<GameCell>();
         for(int i = 0; i < size ; i++) {    // row
             for(int j = 0 ; j < size ; j++) {   // col
-                if(Math.floor(i/3)*3 + Math.floor(j/3) == sec) {
-                    result[c++] = field[i][j];
+                if((int)(Math.floor(i/sectionHeight)*sectionHeight + Math.floor(j/sectionWidth)) == sec) {
+                    result.add(field[i][j]);
                 }
-                if(c > size) {
+                if(result.size() >= sectionHeight*sectionWidth) {
                     break;
                 }
             }
@@ -83,10 +105,34 @@ public class GameField {
         return result;
     }
 
+    public LinkedList<GameCell> getSection(int row, int col) {
+        int sec = (int) (Math.floor(row / sectionHeight) * sectionHeight + Math.floor(col / sectionWidth));
+        return getSection(sec);
+    }
 
+    public int getSize() {
+        return size;
+    }
 
+    @Override
+    public String toString() {
+        StringBuilder sb = new StringBuilder();
 
+        sb.append("GameField: "); sb.append("\n");
 
+        for(int i = 0; i < size; i++) {
 
+            for(int j = 0; j < size; j++) {
+                if(j % sectionWidth == 0) {
+                    sb.append("\t");
+                }
 
+                sb.append(getField()[i][j]);
+                sb.append(" ");
+            }
+
+            sb.append("\n");
+        }
+        return sb.toString();
+    }
 }
diff --git a/app/src/main/java/tu_darmstadt/sudoku/game/GameSettings.java b/app/src/main/java/tu_darmstadt/sudoku/game/GameSettings.java
new file mode 100644
index 0000000..c43033a
--- /dev/null
+++ b/app/src/main/java/tu_darmstadt/sudoku/game/GameSettings.java
@@ -0,0 +1,12 @@
+package tu_darmstadt.sudoku.game;
+
+/**
+ * Created by Chris on 09.11.2015.
+ */
+public class GameSettings {
+    private boolean enableAutomaticNoteDeletion = true;
+
+    public boolean getEnableAutomaticNoteDeletion() {
+        return enableAutomaticNoteDeletion;
+    }
+}
diff --git a/app/src/main/java/tu_darmstadt/sudoku/game/GameStatus.java b/app/src/main/java/tu_darmstadt/sudoku/game/GameStatus.java
new file mode 100644
index 0000000..9bdc701
--- /dev/null
+++ b/app/src/main/java/tu_darmstadt/sudoku/game/GameStatus.java
@@ -0,0 +1,11 @@
+package tu_darmstadt.sudoku.game;
+
+/**
+ * Created by Chris on 10.11.2015.
+ */
+public enum GameStatus {
+    Unspecified,
+    Running,
+    Paused,
+
+}
diff --git a/app/src/main/java/tu_darmstadt/sudoku/game/GameType.java b/app/src/main/java/tu_darmstadt/sudoku/game/GameType.java
new file mode 100644
index 0000000..d7a1599
--- /dev/null
+++ b/app/src/main/java/tu_darmstadt/sudoku/game/GameType.java
@@ -0,0 +1,10 @@
+package tu_darmstadt.sudoku.game;
+
+/**
+ * Created by Chris on 09.11.2015.
+ */
+public enum GameType {
+    Unspecified,
+    Default_9x9
+
+}
diff --git a/app/src/main/java/tu_darmstadt/sudoku/view/GameView.java b/app/src/main/java/tu_darmstadt/sudoku/view/GameView.java
new file mode 100644
index 0000000..271511b
--- /dev/null
+++ b/app/src/main/java/tu_darmstadt/sudoku/view/GameView.java
@@ -0,0 +1,108 @@
+package tu_darmstadt.sudoku.view;
+
+import android.os.Bundle;
+import android.support.design.widget.FloatingActionButton;
+import android.support.design.widget.Snackbar;
+import android.util.Log;
+import android.view.View;
+import android.support.design.widget.NavigationView;
+import android.support.v4.view.GravityCompat;
+import android.support.v4.widget.DrawerLayout;
+import android.support.v7.app.ActionBarDrawerToggle;
+import android.support.v7.app.AppCompatActivity;
+import android.support.v7.widget.Toolbar;
+import android.view.Menu;
+import android.view.MenuItem;
+import tu_darmstadt.sudoku.controller.GameController;
+import tu_darmstadt.sudoku.game.*;
+
+public class GameView extends AppCompatActivity implements NavigationView.OnNavigationItemSelectedListener {
+
+    GameController gameController = new GameController(GameType.Default_9x9);
+
+    @Override
+    protected void onCreate(Bundle savedInstanceState) {
+        super.onCreate(savedInstanceState);
+        setContentView(R.layout.activity_game_view);
+        Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
+        setSupportActionBar(toolbar);
+
+        FloatingActionButton fab = (FloatingActionButton) findViewById(R.id.fab);
+        fab.setOnClickListener(new View.OnClickListener() {
+            @Override
+            public void onClick(View view) {
+                /* DEBUG */
+                String debug = gameController.getFieldAsString();
+                Log.d("Sudoku", debug);
+
+                Snackbar.make(view, "Printed example Sudoku board in console.", Snackbar.LENGTH_LONG).setAction("Action", null).show();
+            }
+        });
+
+        DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
+        ActionBarDrawerToggle toggle = new ActionBarDrawerToggle(
+                this, drawer, toolbar, R.string.navigation_drawer_open, R.string.navigation_drawer_close);
+        drawer.setDrawerListener(toggle);
+        toggle.syncState();
+
+        NavigationView navigationView = (NavigationView) findViewById(R.id.nav_view);
+        navigationView.setNavigationItemSelectedListener(this);
+    }
+
+    @Override
+    public void onBackPressed() {
+        DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
+        if (drawer.isDrawerOpen(GravityCompat.START)) {
+            drawer.closeDrawer(GravityCompat.START);
+        } else {
+            super.onBackPressed();
+        }
+    }
+
+    @Override
+    public boolean onCreateOptionsMenu(Menu menu) {
+        // Inflate the menu; this adds items to the action bar if it is present.
+        getMenuInflater().inflate(R.menu.game_view, menu);
+        return true;
+    }
+
+    @Override
+    public boolean onOptionsItemSelected(MenuItem item) {
+        // Handle action bar item clicks here. The action bar will
+        // automatically handle clicks on the Home/Up button, so long
+        // as you specify a parent activity in AndroidManifest.xml.
+        int id = item.getItemId();
+
+        //noinspection SimplifiableIfStatement
+        if (id == R.id.action_settings) {
+            return true;
+        }
+
+        return super.onOptionsItemSelected(item);
+    }
+
+    @SuppressWarnings("StatementWithEmptyBody")
+    @Override
+    public boolean onNavigationItemSelected(MenuItem item) {
+        // Handle navigation view item clicks here.
+        int id = item.getItemId();
+
+        if (id == R.id.nav_camara) {
+            // Handle the camera action
+        } else if (id == R.id.nav_gallery) {
+
+        } else if (id == R.id.nav_slideshow) {
+
+        } else if (id == R.id.nav_manage) {
+
+        } else if (id == R.id.nav_share) {
+
+        } else if (id == R.id.nav_send) {
+
+        }
+
+        DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
+        drawer.closeDrawer(GravityCompat.START);
+        return true;
+    }
+}
diff --git a/app/src/main/java/tu_darmstadt/sudoku/view/MainMenu.java b/app/src/main/java/tu_darmstadt/sudoku/view/MainMenu.java
index 3ffa23b..d016c10 100644
--- a/app/src/main/java/tu_darmstadt/sudoku/view/MainMenu.java
+++ b/app/src/main/java/tu_darmstadt/sudoku/view/MainMenu.java
@@ -15,8 +15,8 @@ public class MainMenu extends AppCompatActivity {
     protected void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
         setContentView(R.layout.activity_main_menu);
-        Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
-        setSupportActionBar(toolbar);
+        //Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
+        //setSupportActionBar(toolbar);
 
         FloatingActionButton fab = (FloatingActionButton) findViewById(R.id.fab);
         fab.setOnClickListener(new View.OnClickListener() {
diff --git a/app/src/main/res/drawable/side_nav_bar.xml b/app/src/main/res/drawable/side_nav_bar.xml
new file mode 100644
index 0000000..c145985
--- /dev/null
+++ b/app/src/main/res/drawable/side_nav_bar.xml
@@ -0,0 +1,9 @@
+<shape xmlns:android="http://schemas.android.com/apk/res/android"
+    android:shape="rectangle" >
+    <gradient
+        android:startColor="#81C784"
+        android:centerColor="#4CAF50"
+        android:endColor="#2E7D32"
+        android:type="linear"
+        android:angle="135"/>
+</shape>
\ No newline at end of file
diff --git a/app/src/main/res/layout/activity_game_view.xml b/app/src/main/res/layout/activity_game_view.xml
new file mode 100644
index 0000000..57a3e0a
--- /dev/null
+++ b/app/src/main/res/layout/activity_game_view.xml
@@ -0,0 +1,17 @@
+<?xml version="1.0" encoding="utf-8"?>
+<android.support.v4.widget.DrawerLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:app="http://schemas.android.com/apk/res-auto"
+    xmlns:tools="http://schemas.android.com/tools" android:id="@+id/drawer_layout"
+    android:layout_width="match_parent" android:layout_height="match_parent"
+    android:fitsSystemWindows="true" tools:openDrawer="start">
+
+    <include layout="@layout/app_bar_game_view" android:layout_width="match_parent"
+        android:layout_height="match_parent" />
+
+    <android.support.design.widget.NavigationView android:id="@+id/nav_view"
+        android:layout_width="wrap_content" android:layout_height="match_parent"
+        android:layout_gravity="start" android:fitsSystemWindows="true"
+        app:headerLayout="@layout/nav_header_game_view"
+        app:menu="@menu/activity_game_view_drawer" />
+
+</android.support.v4.widget.DrawerLayout>
diff --git a/app/src/main/res/layout/activity_main_menu.xml b/app/src/main/res/layout/activity_main_menu.xml
index 08f76be..7697f78 100644
--- a/app/src/main/res/layout/activity_main_menu.xml
+++ b/app/src/main/res/layout/activity_main_menu.xml
@@ -8,10 +8,6 @@
     <android.support.design.widget.AppBarLayout android:layout_height="wrap_content"
         android:layout_width="match_parent" android:theme="@style/AppTheme.AppBarOverlay">
 
-        <android.support.v7.widget.Toolbar android:id="@+id/toolbar"
-            android:layout_width="match_parent" android:layout_height="?attr/actionBarSize"
-            android:background="?attr/colorPrimary" app:popupTheme="@style/AppTheme.PopupOverlay" />
-
     </android.support.design.widget.AppBarLayout>
 
     <include layout="@layout/content_main_menu" />
diff --git a/app/src/main/res/layout/app_bar_game_view.xml b/app/src/main/res/layout/app_bar_game_view.xml
new file mode 100644
index 0000000..fecb452
--- /dev/null
+++ b/app/src/main/res/layout/app_bar_game_view.xml
@@ -0,0 +1,25 @@
+<?xml version="1.0" encoding="utf-8"?>
+<android.support.design.widget.CoordinatorLayout
+    xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:app="http://schemas.android.com/apk/res-auto"
+    xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent"
+    android:layout_height="match_parent" android:fitsSystemWindows="true"
+    tools:context="tu_darmstadt.sudoku.view.GameView">
+
+    <android.support.design.widget.AppBarLayout android:layout_height="wrap_content"
+        android:layout_width="match_parent" android:theme="@style/AppTheme.AppBarOverlay">
+
+        <android.support.v7.widget.Toolbar android:id="@+id/toolbar"
+            android:layout_width="match_parent" android:layout_height="?attr/actionBarSize"
+            android:background="?attr/colorPrimary" app:popupTheme="@style/AppTheme.PopupOverlay" />
+
+    </android.support.design.widget.AppBarLayout>
+
+    <include layout="@layout/content_game_view" />
+
+    <android.support.design.widget.FloatingActionButton android:id="@+id/fab"
+        android:layout_width="wrap_content" android:layout_height="wrap_content"
+        android:layout_gravity="bottom|end" android:layout_margin="@dimen/fab_margin"
+        android:src="@android:drawable/ic_dialog_email" />
+
+</android.support.design.widget.CoordinatorLayout>
diff --git a/app/src/main/res/layout/content_game_view.xml b/app/src/main/res/layout/content_game_view.xml
new file mode 100644
index 0000000..8141eb9
--- /dev/null
+++ b/app/src/main/res/layout/content_game_view.xml
@@ -0,0 +1,12 @@
+<?xml version="1.0" encoding="utf-8"?>
+<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:tools="http://schemas.android.com/tools"
+    xmlns:app="http://schemas.android.com/apk/res-auto" android:layout_width="match_parent"
+    android:layout_height="match_parent" android:paddingLeft="@dimen/activity_horizontal_margin"
+    android:paddingRight="@dimen/activity_horizontal_margin"
+    android:paddingTop="@dimen/activity_vertical_margin"
+    android:paddingBottom="@dimen/activity_vertical_margin"
+    app:layout_behavior="@string/appbar_scrolling_view_behavior"
+    tools:showIn="@layout/app_bar_game_view" tools:context="tu_darmstadt.sudoku.view.GameView">
+
+</RelativeLayout>
diff --git a/app/src/main/res/layout/nav_header_game_view.xml b/app/src/main/res/layout/nav_header_game_view.xml
new file mode 100644
index 0000000..53597e6
--- /dev/null
+++ b/app/src/main/res/layout/nav_header_game_view.xml
@@ -0,0 +1,23 @@
+<?xml version="1.0" encoding="utf-8"?>
+<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    android:layout_width="match_parent" android:layout_height="@dimen/nav_header_height"
+    android:background="@drawable/side_nav_bar"
+    android:paddingBottom="@dimen/activity_vertical_margin"
+    android:paddingLeft="@dimen/activity_horizontal_margin"
+    android:paddingRight="@dimen/activity_horizontal_margin"
+    android:paddingTop="@dimen/activity_vertical_margin"
+    android:theme="@style/ThemeOverlay.AppCompat.Dark" android:orientation="vertical"
+    android:gravity="bottom">
+
+    <ImageView android:layout_width="wrap_content" android:layout_height="wrap_content"
+        android:paddingTop="@dimen/nav_header_vertical_spacing"
+        android:src="@android:drawable/sym_def_app_icon" android:id="@+id/imageView" />
+
+    <TextView android:layout_width="match_parent" android:layout_height="wrap_content"
+        android:paddingTop="@dimen/nav_header_vertical_spacing" android:text="Android Studio"
+        android:textAppearance="@style/TextAppearance.AppCompat.Body1" />
+
+    <TextView android:layout_width="wrap_content" android:layout_height="wrap_content"
+        android:text="android.studio@android.com" android:id="@+id/textView" />
+
+</LinearLayout>
diff --git a/app/src/main/res/menu/activity_game_view_drawer.xml b/app/src/main/res/menu/activity_game_view_drawer.xml
new file mode 100644
index 0000000..fed8d76
--- /dev/null
+++ b/app/src/main/res/menu/activity_game_view_drawer.xml
@@ -0,0 +1,24 @@
+<?xml version="1.0" encoding="utf-8"?>
+<menu xmlns:android="http://schemas.android.com/apk/res/android">
+
+    <group android:checkableBehavior="single">
+        <item android:id="@+id/nav_camara" android:icon="@android:drawable/ic_menu_camera"
+            android:title="Import" />
+        <item android:id="@+id/nav_gallery" android:icon="@android:drawable/ic_menu_gallery"
+            android:title="Gallery" />
+        <item android:id="@+id/nav_slideshow" android:icon="@android:drawable/ic_menu_slideshow"
+            android:title="Slideshow" />
+        <item android:id="@+id/nav_manage" android:icon="@android:drawable/ic_menu_manage"
+            android:title="Tools" />
+    </group>
+
+    <item android:title="Communicate">
+        <menu>
+            <item android:id="@+id/nav_share" android:icon="@android:drawable/ic_menu_share"
+                android:title="Share" />
+            <item android:id="@+id/nav_send" android:icon="@android:drawable/ic_menu_send"
+                android:title="Send" />
+        </menu>
+    </item>
+
+</menu>
\ No newline at end of file
diff --git a/app/src/main/res/menu/game_view.xml b/app/src/main/res/menu/game_view.xml
new file mode 100644
index 0000000..47a66d9
--- /dev/null
+++ b/app/src/main/res/menu/game_view.xml
@@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="utf-8"?>
+<menu xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:app="http://schemas.android.com/apk/res-auto">
+    <item android:id="@+id/action_settings" android:title="@string/action_settings"
+        android:orderInCategory="100" app:showAsAction="never" />
+</menu>
diff --git a/app/src/main/res/values/dimens.xml b/app/src/main/res/values/dimens.xml
index 812cb7b..5cf49e9 100644
--- a/app/src/main/res/values/dimens.xml
+++ b/app/src/main/res/values/dimens.xml
@@ -3,4 +3,7 @@
     <dimen name="activity_horizontal_margin">16dp</dimen>
     <dimen name="activity_vertical_margin">16dp</dimen>
     <dimen name="fab_margin">16dp</dimen>
+    <!-- Default screen margins, per the Android Design guidelines. -->
+    <dimen name="nav_header_vertical_spacing">16dp</dimen>
+    <dimen name="nav_header_height">160dp</dimen>
 </resources>
diff --git a/app/src/main/res/values/strings.xml b/app/src/main/res/values/strings.xml
index 39f0926..a5e1065 100644
--- a/app/src/main/res/values/strings.xml
+++ b/app/src/main/res/values/strings.xml
@@ -1,4 +1,8 @@
 <resources>
     <string name="app_name">Sudoku</string>
     <string name="action_settings">Settings</string>
+    <string name="title_activity_game_view">GameView</string>
+
+    <string name="navigation_drawer_open">Open navigation drawer</string>
+    <string name="navigation_drawer_close">Close navigation drawer</string>
 </resources>
diff --git a/app/src/test/java/tu_darmstadt/sudoku/controller/GameControllerTest.java b/app/src/test/java/tu_darmstadt/sudoku/controller/GameControllerTest.java
new file mode 100644
index 0000000..122ffaf
--- /dev/null
+++ b/app/src/test/java/tu_darmstadt/sudoku/controller/GameControllerTest.java
@@ -0,0 +1,214 @@
+package tu_darmstadt.sudoku.controller;
+
+import org.junit.Before;
+import org.junit.BeforeClass;
+import org.junit.Test;
+
+import tu_darmstadt.sudoku.game.GameType;
+
+import static org.junit.Assert.*;
+
+/**
+ * Created by Chris on 10.11.2015.
+ */
+public class GameControllerTest {
+
+    GameController controller;
+
+    @Before
+    public void init() {
+        controller = new GameController();
+        int[][] level = {{ 5, 0, 1,  9, 0, 0,  0, 0, 0 },
+                         { 2, 0, 0,  0, 0, 4,  9, 5, 0 },
+                         { 3, 9, 0,  7, 0, 0,  0, 2, 6 },
+
+                         { 0, 3, 0,  0, 0, 1,  0, 7, 2 },
+                         { 0, 0, 6,  0, 5, 7,  0, 0, 0 },
+                         { 0, 7, 2,  0, 0, 9,  0, 4, 1 },
+
+                         { 0, 0, 0,  0, 7, 0,  4, 0, 9 },
+                         { 6, 4, 0,  0, 0, 0,  0, 0, 0 },
+                         { 7, 0, 0,  0, 1, 0,  3, 0, 5 }};
+
+
+    }
+
+
+    @Test
+    public void setValueOfFixedCellTest() {
+        assertEquals(5, controller.getValue(0, 0));
+        controller.setValue(0, 0, 6);
+        assertEquals(5, controller.getValue(0, 0));
+    }
+
+    @Test
+    public void setValueOfFreeCellTest() {
+        assertEquals(0, controller.getValue(0, 1));
+        controller.setValue(0, 1, 6);
+        assertEquals(6, controller.getValue(0, 1));
+    }
+
+    @Test
+    public void solveTest1() {
+        controller.setValue(0, 1, 8);
+        controller.setValue(0, 4, 2);
+        controller.setValue(0, 5, 6);
+        controller.setValue(0, 6, 7);
+        controller.setValue(0, 7, 3);
+        controller.setValue(0, 8, 4);
+        controller.setValue(1, 1, 6);
+        controller.setValue(1, 2, 7);
+        controller.setValue(1, 3, 1);
+        controller.setValue(1, 4, 3);
+        controller.setValue(1, 8, 8);
+        controller.setValue(2, 2, 4);
+        controller.setValue(2, 4, 8);
+        controller.setValue(2, 5, 5);
+        controller.setValue(2, 6, 1);
+        controller.setValue(3, 0, 9);
+        controller.setValue(3, 2, 5);
+        controller.setValue(3, 3, 8);
+        controller.setValue(3, 4, 4);
+        controller.setValue(3, 6, 6);
+        controller.setValue(4, 0, 4);
+        controller.setValue(4, 1, 1);
+        controller.setValue(4, 3, 2);
+        controller.setValue(4, 6, 8);
+        controller.setValue(4, 7, 9);
+        controller.setValue(4, 8, 3);
+        controller.setValue(5, 0, 8);
+        controller.setValue(5, 3, 3);
+        controller.setValue(5, 4, 6);
+        controller.setValue(5, 6, 5);
+        controller.setValue(6, 0, 1);
+        controller.setValue(6, 1, 5);
+        controller.setValue(6, 2, 3);
+        controller.setValue(6, 3, 6);
+        controller.setValue(6, 5, 2);
+        controller.setValue(6, 7, 8);
+        controller.setValue(7, 2, 8);
+        controller.setValue(7, 3, 5);
+        controller.setValue(7, 4, 9);
+        controller.setValue(7, 5, 3);
+        controller.setValue(7, 6, 2);
+        controller.setValue(7, 7, 1);
+        controller.setValue(7, 8, 7);
+        controller.setValue(8, 1, 2);
+        controller.setValue(8, 2, 9);
+        controller.setValue(8, 3, 4);
+        controller.setValue(8, 5, 8);
+        controller.setValue(8, 7, 6);
+
+        assertTrue(controller.isSolved());
+        assertEquals(0, controller.getErrorList().size());
+    }
+
+    @Test
+    public void solveTest2() {
+
+        controller.setValue(0, 1, 8);
+        controller.setValue(0, 4, 2);
+        controller.setValue(0, 5, 6);
+        controller.setValue(0, 6, 7);
+        controller.setValue(0, 7, 3);
+        controller.setValue(0, 8, 4);
+        controller.setValue(1, 1, 6);
+        controller.setValue(1, 2, 7);
+        controller.setValue(1, 3, 1);
+        controller.setValue(1, 4, 3);
+        controller.setValue(1, 8, 8);
+        controller.setValue(2, 2, 4);
+        controller.setValue(2, 4, 8);
+        controller.setValue(2, 5, 5);
+        controller.setValue(2, 6, 1);
+        controller.setValue(3, 0, 9);
+        controller.setValue(3, 2, 5);
+        controller.setValue(3, 3, 8);
+        controller.setValue(3, 4, 4);
+        controller.setValue(3, 6, 6);
+        controller.setValue(4, 0, 4);
+        controller.setValue(4, 1, 1);
+        controller.setValue(4, 3, 2);
+        controller.setValue(4, 6, 8);
+        controller.setValue(4, 7, 9);
+        controller.setValue(4, 8, 3);
+        controller.setValue(5, 0, 8);
+        controller.setValue(5, 3, 3);
+        controller.setValue(5, 4, 6);
+        controller.setValue(5, 6, 5);
+        controller.setValue(6, 0, 1);
+        controller.setValue(6, 1, 5);
+        controller.setValue(6, 2, 3);
+        controller.setValue(6, 3, 1);
+        controller.setValue(6, 5, 2);
+        controller.setValue(6, 7, 8);
+        controller.setValue(7, 2, 8);
+        controller.setValue(7, 3, 5);
+        controller.setValue(7, 4, 9);
+        controller.setValue(7, 5, 3);
+        controller.setValue(7, 6, 2);
+        controller.setValue(7, 7, 1);
+        controller.setValue(7, 8, 7);
+        controller.setValue(8, 1, 2);
+        controller.setValue(8, 2, 9);
+        controller.setValue(8, 3, 4);
+        controller.setValue(8, 5, 8);
+        controller.setValue(8, 7, 6);
+
+        assertFalse(controller.isSolved());
+        assertEquals(1, controller.getErrorList().size());
+    }
+
+    @Test
+    public void solveTest3() {
+        controller.setValue(0, 4, 2);
+        controller.setValue(0, 5, 6);
+        controller.setValue(0, 6, 7);
+        controller.setValue(0, 7, 3);
+        controller.setValue(0, 8, 4);
+        controller.setValue(1, 1, 6);
+        controller.setValue(1, 2, 7);
+        controller.setValue(1, 3, 1);
+        controller.setValue(1, 4, 3);
+        controller.setValue(1, 8, 8);
+        controller.setValue(2, 2, 4);
+        controller.setValue(2, 4, 8);
+        controller.setValue(2, 5, 5);
+        controller.setValue(2, 6, 1);
+        controller.setValue(3, 0, 9);
+        controller.setValue(3, 2, 5);
+        controller.setValue(3, 3, 8);
+        controller.setValue(3, 4, 4);
+        controller.setValue(3, 6, 6);
+        controller.setValue(4, 0, 4);
+        controller.setValue(4, 1, 1);
+        controller.setValue(4, 3, 2);
+        controller.setValue(4, 6, 8);
+        controller.setValue(4, 7, 9);
+        controller.setValue(4, 8, 3);
+        controller.setValue(5, 0, 8);
+        controller.setValue(5, 3, 3);
+        controller.setValue(5, 4, 6);
+        controller.setValue(5, 6, 5);
+        controller.setValue(6, 0, 1);
+        controller.setValue(6, 1, 5);
+        controller.setValue(6, 2, 3);
+        controller.setValue(6, 5, 2);
+        controller.setValue(6, 7, 8);
+        controller.setValue(7, 2, 8);
+        controller.setValue(7, 3, 5);
+        controller.setValue(7, 4, 9);
+        controller.setValue(7, 5, 3);
+        controller.setValue(7, 6, 2);
+        controller.setValue(7, 7, 1);
+        controller.setValue(7, 8, 7);
+        controller.setValue(8, 1, 2);
+        controller.setValue(8, 2, 9);
+        controller.setValue(8, 3, 4);
+        controller.setValue(8, 5, 8);
+        controller.setValue(8, 7, 6);
+
+        assertFalse(controller.isSolved());
+        assertEquals(0, controller.getErrorList().size());
+    }
+}