diff --git a/src/main/c/sudoku.c b/src/main/c/sudoku.c
index 21fba11..1b134a1 100644
--- a/src/main/c/sudoku.c
+++ b/src/main/c/sudoku.c
@@ -38,88 +38,88 @@ int availableLevels[3][3][SIZE_OF_GAMEBORD_AXIS_X][SIZE_OF_GAMEBORD_AXIS_Y] = {
      {0, 4, 8, 2, 0, 9, 5, 0, 0},
      {5, 0, 0, 7, 0, 3, 2, 0, 0}},
 
-    {{0, 0, 3, 0, 2, 1, 8, 0, 0},
-     {6, 0, 0, 0, 7, 0, 1, 3, 2},
-     {9, 2, 1, 5, 0, 0, 7, 6, 4},
-     {7, 6, 0, 3, 0, 0, 4, 0, 0},
-     {8, 5, 4, 1, 9, 7, 0, 0, 0},
-     {1, 0, 0, 4, 0, 6, 0, 0, 0},
-     {2, 9, 0, 8, 1, 5, 0, 0, 6},
-     {0, 4, 8, 2, 0, 9, 5, 0, 0},
-     {5, 0, 0, 7, 0, 3, 2, 0, 2}},
-
-    {{0, 0, 3, 0, 2, 1, 8, 0, 0},
-     {6, 0, 0, 0, 7, 0, 1, 3, 2},
-     {9, 2, 1, 5, 0, 0, 7, 6, 4},
-     {7, 6, 0, 3, 0, 0, 4, 0, 0},
-     {8, 5, 4, 1, 9, 7, 0, 0, 0},
-     {1, 0, 0, 4, 0, 6, 0, 0, 0},
-     {2, 9, 0, 8, 1, 5, 0, 0, 6},
-     {0, 4, 8, 2, 0, 9, 5, 0, 0},
-     {5, 0, 0, 7, 0, 3, 2, 0, 0}}},
+    {{7, 0, 2, 0, 0, 0, 9, 5, 0},
+     {0, 8, 0, 7, 5, 0, 2, 1, 6},
+     {0, 0, 5, 5, 2, 8, 7, 0, 3},
+     {5, 1, 8, 4, 3, 0, 6, 0, 0},
+     {0, 0, 6, 1, 0, 0, 5, 3, 0},
+     {0, 0, 0, 0, 6, 2, 0, 8, 1},
+     {0, 9, 0, 2, 0, 4, 0, 0, 5},
+     {0, 2, 0, 0, 9, 5, 0, 7, 4},
+     {0, 5, 1, 0, 0, 0, 0, 9, 2}},
+
+    {{4, 2, 5, 0, 9, 7, 1, 3, 0},
+     {0, 7, 0, 1, 0, 3, 0, 0, 6},
+     {0, 6, 1, 4, 8, 2, 0, 0, 0},
+     {1, 0, 0, 0, 3, 0, 0, 6, 0},
+     {7, 0, 8, 0, 2, 0, 0, 1, 3},
+     {9, 3, 0, 0, 4, 1, 5, 7, 2},
+     {0, 0, 7, 9, 6, 5, 0, 0, 0},
+     {0, 0, 4, 3, 7, 0, 2, 0, 5},
+     {0, 0, 0, 2, 1, 0, 0, 0, 0}}},
 
     {//medium
      {{0, 0, 3, 0, 2, 1, 8, 0, 0},
-     {6, 0, 0, 0, 7, 0, 1, 3, 2},
-     {9, 2, 1, 5, 0, 0, 7, 6, 4},
+     {6, 0, 0, 0, 0, 0, 1, 3, 2},
+     {0, 2, 1, 0, 0, 0, 7, 6, 4},
      {7, 6, 0, 3, 0, 0, 4, 0, 0},
-     {8, 5, 4, 1, 9, 7, 0, 0, 0},
+     {0, 5, 0, 1, 0, 7, 0, 0, 0},
      {1, 0, 0, 4, 0, 6, 0, 0, 0},
-     {2, 9, 0, 8, 1, 5, 0, 0, 6},
-     {0, 4, 8, 2, 0, 9, 5, 0, 0},
+     {2, 0, 0, 8, 0, 0, 0, 0, 6},
+     {0, 4, 0, 0, 0, 9, 5, 0, 0},
      {5, 0, 0, 7, 0, 3, 2, 0, 0}},
 
-    {{0, 0, 3, 0, 2, 1, 8, 0, 0},
-     {6, 0, 0, 0, 7, 0, 1, 3, 2},
-     {9, 2, 1, 5, 0, 0, 7, 6, 4},
-     {7, 6, 0, 3, 0, 0, 4, 0, 0},
-     {8, 5, 4, 1, 9, 7, 0, 0, 0},
-     {1, 0, 0, 4, 0, 6, 0, 0, 0},
-     {2, 9, 0, 8, 1, 5, 0, 0, 6},
-     {0, 4, 8, 2, 0, 9, 5, 0, 0},
-     {5, 0, 0, 7, 0, 3, 2, 0, 0}},
-
-    {{0, 0, 3, 0, 2, 1, 8, 0, 0},
-     {6, 0, 0, 0, 7, 0, 1, 3, 2},
-     {9, 2, 1, 5, 0, 0, 7, 6, 4},
-     {7, 6, 0, 3, 0, 0, 4, 0, 0},
-     {8, 5, 4, 1, 9, 7, 0, 0, 0},
-     {1, 0, 0, 4, 0, 6, 0, 0, 0},
-     {2, 9, 0, 8, 1, 5, 0, 0, 6},
-     {0, 4, 8, 2, 0, 9, 5, 0, 0},
-     {5, 0, 0, 7, 0, 3, 2, 0, 0}}
+    {{7, 0, 2, 0, 0, 0, 9, 5, 0},
+     {0, 0, 0, 7, 5, 0, 2, 0, 6},
+     {0, 0, 5, 0, 2, 8, 7, 0, 3},
+     {5, 1, 8, 0, 3, 0, 6, 0, 0},
+     {0, 0, 6, 1, 0, 0, 0, 3, 0},
+     {0, 0, 0, 0, 6, 2, 0, 8, 1},
+     {0, 9, 0, 2, 0, 4, 0, 0, 5},
+     {0, 0, 0, 0, 9, 0, 0, 0, 4},
+     {0, 5, 1, 0, 0, 0, 0, 9, 2}},
+
+    {{4, 2, 5, 0, 9, 7, 1, 3, 0},
+     {0, 0, 0, 1, 0, 3, 0, 0, 6},
+     {0, 6, 0, 4, 0, 2, 0, 0, 0},
+     {1, 0, 0, 0, 3, 0, 0, 6, 0},
+     {7, 0, 8, 0, 2, 0, 0, 1, 3},
+     {0, 3, 0, 0, 0, 1, 0, 7, 2},
+     {0, 0, 7, 9, 6, 0, 0, 0, 0},
+     {0, 0, 4, 3, 7, 0, 2, 0, 5},
+     {0, 0, 0, 2, 1, 0, 0, 0, 0}}
     },
 
     {//hard
-    {{0, 0, 3, 0, 2, 1, 8, 0, 0},
-     {6, 0, 0, 0, 7, 0, 1, 3, 2},
-     {9, 2, 1, 5, 0, 0, 7, 6, 4},
-     {7, 6, 0, 3, 0, 0, 4, 0, 0},
-     {8, 5, 4, 1, 9, 7, 0, 0, 0},
-     {1, 0, 0, 4, 0, 6, 0, 0, 0},
-     {2, 9, 0, 8, 1, 5, 0, 0, 6},
-     {0, 4, 8, 2, 0, 9, 5, 0, 0},
-     {5, 0, 0, 7, 0, 3, 2, 0, 0}},
-
-    {{0, 0, 3, 0, 2, 1, 8, 0, 0},
-     {6, 0, 0, 0, 7, 0, 1, 3, 2},
+    {{0, 0, 3, 0, 2, 0, 8, 0, 0},
+     {6, 0, 0, 0, 0, 0, 0, 3, 0},
      {9, 2, 1, 5, 0, 0, 7, 6, 4},
-     {7, 6, 0, 3, 0, 0, 4, 0, 0},
-     {8, 5, 4, 1, 9, 7, 0, 0, 0},
-     {1, 0, 0, 4, 0, 6, 0, 0, 0},
-     {2, 9, 0, 8, 1, 5, 0, 0, 6},
-     {0, 4, 8, 2, 0, 9, 5, 0, 0},
-     {5, 0, 0, 7, 0, 3, 2, 0, 0}},
-
-    {{0, 0, 3, 0, 2, 1, 8, 0, 0},
-     {6, 0, 0, 0, 7, 0, 1, 3, 2},
-     {9, 2, 1, 5, 0, 0, 7, 6, 4},
-     {7, 6, 0, 3, 0, 0, 4, 0, 0},
-     {8, 5, 4, 1, 9, 7, 0, 0, 0},
-     {1, 0, 0, 4, 0, 6, 0, 0, 0},
-     {2, 9, 0, 8, 1, 5, 0, 0, 6},
-     {0, 4, 8, 2, 0, 9, 5, 0, 0},
-     {5, 0, 0, 7, 0, 3, 2, 0, 0}}
+     {0, 0, 0, 3, 0, 0, 0, 0, 0},
+     {0, 5, 4, 1, 0, 7, 0, 0, 0},
+     {1, 0, 0, 0, 0, 0, 0, 0, 0},
+     {2, 0, 0, 0, 1, 5, 0, 0, 6},
+     {0, 4, 0, 2, 0, 0, 0, 0, 0},
+     {5, 0, 0, 0, 0, 3, 2, 0, 0}},
+
+    {{7, 0, 2, 0, 0, 0, 9, 0, 0},
+     {0, 0, 0, 7, 0, 0, 0, 1, 6},
+     {0, 0, 5, 0, 0, 8, 7, 0, 3},
+     {5, 0, 0, 4, 0, 0, 6, 0, 0},
+     {0, 0, 6, 1, 0, 0, 5, 3, 0},
+     {0, 0, 0, 0, 0, 2, 0, 0, 1},
+     {0, 9, 0, 2, 0, 4, 0, 0, 0},
+     {0, 2, 0, 0, 0, 5, 0, 7, 0},
+     {0, 5, 0, 0, 0, 0, 0, 9, 2}},
+
+    {{4, 0, 5, 0, 9, 7, 1, 3, 0},
+     {0, 0, 0, 0, 0, 3, 0, 0, 6},
+     {0, 6, 1, 4, 0, 2, 0, 0, 0},
+     {1, 0, 0, 0, 3, 0, 0, 6, 0},
+     {0, 0, 8, 0, 0, 0, 0, 0, 3},
+     {9, 3, 0, 0, 4, 1, 5, 7, 2},
+     {0, 0, 7, 9, 0, 5, 0, 0, 0},
+     {0, 0, 4, 3, 0, 0, 2, 0, 5},
+     {0, 0, 0, 2, 1, 0, 0, 0, 0}}
     }
 };
 
@@ -136,25 +136,25 @@ int solutionLevels[3][3][SIZE_OF_GAMEBORD_AXIS_X][SIZE_OF_GAMEBORD_AXIS_Y] = {
      {3, 4, 8, 2, 6, 9, 5, 1, 7},
      {5, 1, 6, 7, 4, 3, 2, 9, 8}},
 
-    {{4, 7, 3, 6, 2, 1, 8, 5, 9},
-     {6, 8, 5, 9, 7, 4, 1, 3, 2},
-     {9, 2, 1, 5, 3, 8, 7, 6, 4},
-     {7, 6, 9, 3, 5, 2, 4, 8, 1},
-     {8, 5, 4, 1, 9, 7, 6, 2, 3},
-     {1, 3, 2, 4, 8, 6, 9, 7, 5},
-     {2, 9, 7, 8, 1, 5, 3, 4, 6},
-     {3, 4, 8, 2, 6, 9, 5, 1, 7},
-     {5, 1, 6, 7, 4, 3, 2, 9, 8}},
-
-    {{4, 7, 3, 6, 2, 1, 8, 5, 9},
-     {6, 8, 5, 9, 7, 4, 1, 3, 2},
-     {9, 2, 1, 5, 3, 8, 7, 6, 4},
-     {7, 6, 9, 3, 5, 2, 4, 8, 1},
-     {8, 5, 4, 1, 9, 7, 6, 2, 3},
-     {1, 3, 2, 4, 8, 6, 9, 7, 5},
-     {2, 9, 7, 8, 1, 5, 3, 4, 6},
-     {3, 4, 8, 2, 6, 9, 5, 1, 7},
-     {5, 1, 6, 7, 4, 3, 2, 9, 8}}},
+    {{7, 3, 2, 6, 4, 1, 9, 5, 8},
+     {9, 8, 4, 7, 5, 3, 2, 1, 6},
+     {1, 6, 5, 9, 2, 8, 7, 4, 3},
+     {5, 1, 8, 4, 3, 7, 6, 2, 9},
+     {2, 4, 6, 1, 8, 9, 5, 3, 7},
+     {3, 7, 9, 5, 6, 2, 4, 8, 1},
+     {8, 9, 7, 2, 1, 4, 3, 6, 5},
+     {6, 2, 3, 8, 9, 5, 1, 7, 4},
+     {4, 5, 1, 3, 7, 6, 8, 9, 2}},
+
+    {{4, 2, 5, 6, 9, 7, 1, 3, 8},
+     {8, 7, 9, 1, 5, 3, 4, 2, 6},
+     {3, 6, 1, 4, 8, 2, 7, 5, 9},
+     {1, 5, 2, 7, 3, 9, 8, 6, 4},
+     {7, 4, 8, 5, 2, 6, 9, 1, 3},
+     {9, 3, 6, 8, 4, 1, 5, 7, 2},
+     {2, 8, 7, 9, 6, 5, 3, 4, 1},
+     {6, 1, 4, 3, 7, 8, 2, 9, 5},
+     {5, 9, 3, 2, 1, 4, 6, 8, 7}}},
 
     {//medium
      {{4, 7, 3, 6, 2, 1, 8, 5, 9},
@@ -167,25 +167,25 @@ int solutionLevels[3][3][SIZE_OF_GAMEBORD_AXIS_X][SIZE_OF_GAMEBORD_AXIS_Y] = {
      {3, 4, 8, 2, 6, 9, 5, 1, 7},
      {5, 1, 6, 7, 4, 3, 2, 9, 8}},
 
-    {{4, 7, 3, 6, 2, 1, 8, 5, 9},
-     {6, 8, 5, 9, 7, 4, 1, 3, 2},
-     {9, 2, 1, 5, 3, 8, 7, 6, 4},
-     {7, 6, 9, 3, 5, 2, 4, 8, 1},
-     {8, 5, 4, 1, 9, 7, 6, 2, 3},
-     {1, 3, 2, 4, 8, 6, 9, 7, 5},
-     {2, 9, 7, 8, 1, 5, 3, 4, 6},
-     {3, 4, 8, 2, 6, 9, 5, 1, 7},
-     {5, 1, 6, 7, 4, 3, 2, 9, 8}},
-
-    {{4, 7, 3, 6, 2, 1, 8, 5, 9},
-     {6, 8, 5, 9, 7, 4, 1, 3, 2},
-     {9, 2, 1, 5, 3, 8, 7, 6, 4},
-     {7, 6, 9, 3, 5, 2, 4, 8, 1},
-     {8, 5, 4, 1, 9, 7, 6, 2, 3},
-     {1, 3, 2, 4, 8, 6, 9, 7, 5},
-     {2, 9, 7, 8, 1, 5, 3, 4, 6},
-     {3, 4, 8, 2, 6, 9, 5, 1, 7},
-     {5, 1, 6, 7, 4, 3, 2, 9, 8}}
+    {{7, 3, 2, 6, 4, 1, 9, 5, 8},
+     {9, 8, 4, 7, 5, 3, 2, 1, 6},
+     {1, 6, 5, 9, 2, 8, 7, 4, 3},
+     {5, 1, 8, 4, 3, 7, 6, 2, 9},
+     {2, 4, 6, 1, 8, 9, 5, 3, 7},
+     {3, 7, 9, 5, 6, 2, 4, 8, 1},
+     {8, 9, 7, 2, 1, 4, 3, 6, 5},
+     {6, 2, 3, 8, 9, 5, 1, 7, 4},
+     {4, 5, 1, 3, 7, 6, 8, 9, 2}},
+
+    {{4, 2, 5, 6, 9, 7, 1, 3, 8},
+     {8, 7, 9, 1, 5, 3, 4, 2, 6},
+     {3, 6, 1, 4, 8, 2, 7, 5, 9},
+     {1, 5, 2, 7, 3, 9, 8, 6, 4},
+     {7, 4, 8, 5, 2, 6, 9, 1, 3},
+     {9, 3, 6, 8, 4, 1, 5, 7, 2},
+     {2, 8, 7, 9, 6, 5, 3, 4, 1},
+     {6, 1, 4, 3, 7, 8, 2, 9, 5},
+     {5, 9, 3, 2, 1, 4, 6, 8, 7}}
     },
 
     {//hard
@@ -199,25 +199,25 @@ int solutionLevels[3][3][SIZE_OF_GAMEBORD_AXIS_X][SIZE_OF_GAMEBORD_AXIS_Y] = {
      {3, 4, 8, 2, 6, 9, 5, 1, 7},
      {5, 1, 6, 7, 4, 3, 2, 9, 8}},
 
-    {{4, 7, 3, 6, 2, 1, 8, 5, 9},
-     {6, 8, 5, 9, 7, 4, 1, 3, 2},
-     {9, 2, 1, 5, 3, 8, 7, 6, 4},
-     {7, 6, 9, 3, 5, 2, 4, 8, 1},
-     {8, 5, 4, 1, 9, 7, 6, 2, 3},
-     {1, 3, 2, 4, 8, 6, 9, 7, 5},
-     {2, 9, 7, 8, 1, 5, 3, 4, 6},
-     {3, 4, 8, 2, 6, 9, 5, 1, 7},
-     {5, 1, 6, 7, 4, 3, 2, 9, 8}},
-
-    {{4, 7, 3, 6, 2, 1, 8, 5, 9},
-     {6, 8, 5, 9, 7, 4, 1, 3, 2},
-     {9, 2, 1, 5, 3, 8, 7, 6, 4},
-     {7, 6, 9, 3, 5, 2, 4, 8, 1},
-     {8, 5, 4, 1, 9, 7, 6, 2, 3},
-     {1, 3, 2, 4, 8, 6, 9, 7, 5},
-     {2, 9, 7, 8, 1, 5, 3, 4, 6},
-     {3, 4, 8, 2, 6, 9, 5, 1, 7},
-     {5, 1, 6, 7, 4, 3, 2, 9, 8}}
+    {{7, 3, 2, 6, 4, 1, 9, 5, 8},
+     {9, 8, 4, 7, 5, 3, 2, 1, 6},
+     {1, 6, 5, 9, 2, 8, 7, 4, 3},
+     {5, 1, 8, 4, 3, 7, 6, 2, 9},
+     {2, 4, 6, 1, 8, 9, 5, 3, 7},
+     {3, 7, 9, 5, 6, 2, 4, 8, 1},
+     {8, 9, 7, 2, 1, 4, 3, 6, 5},
+     {6, 2, 3, 8, 9, 5, 1, 7, 4},
+     {4, 5, 1, 3, 7, 6, 8, 9, 2}},
+
+    {{4, 2, 5, 6, 9, 7, 1, 3, 8},
+     {8, 7, 9, 1, 5, 3, 4, 2, 6},
+     {3, 6, 1, 4, 8, 2, 7, 5, 9},
+     {1, 5, 2, 7, 3, 9, 8, 6, 4},
+     {7, 4, 8, 5, 2, 6, 9, 1, 3},
+     {9, 3, 6, 8, 4, 1, 5, 7, 2},
+     {2, 8, 7, 9, 6, 5, 3, 4, 1},
+     {6, 1, 4, 3, 7, 8, 2, 9, 5},
+     {5, 9, 3, 2, 1, 4, 6, 8, 7}}
     }
 };