diff --git a/Minesweeper/Core/Inc/spielfeld.h b/Minesweeper/Core/Inc/spielfeld.h
index f86119d..c786eac 100644
--- a/Minesweeper/Core/Inc/spielfeld.h
+++ b/Minesweeper/Core/Inc/spielfeld.h
@@ -35,8 +35,9 @@ void placeBombs(int** gameBoard, int size, int numBombs);
 void displayGameBoardUART(int** gameBoard, int size, int numBombs, int numFlags);
 void freeGameBoard(int** gameBoard, int size);
 int** createHiddenGameBoard(int** gameBoard, int size);
-int** revealCell(int** gameBoard, int** hiddenGameBoard, int size, int row, int col);
+void revealCell(int** gameBoard, int** hiddenGameBoard, int size, int row, int col);
 void getPositionIndices(int row, int col, Position* pos);
 void getNewPosition(Position* pos, int dx, int dy, Position* newPos);
+void setFlag(int** hiddenGameBoard, int row, int col, int* numFlags);
 
 #endif /* INC_SPIELFELD_H_ */
diff --git a/Minesweeper/Core/Src/main.c b/Minesweeper/Core/Src/main.c
index ebbc4f9..eb19cff 100644
--- a/Minesweeper/Core/Src/main.c
+++ b/Minesweeper/Core/Src/main.c
@@ -108,8 +108,8 @@ int main(void)
   hiddenGameBoard= createHiddenGameBoard(gameBoard, size);
   displayGameBoardUART(hiddenGameBoard, size, numBombs, numFlags);
 
-  hiddenGameBoard= revealCell(gameBoard, hiddenGameBoard, size, 3, 5);
-  hiddenGameBoard= setFlag(hiddenGameBoard, 6,7, numFlags);
+  revealCell(gameBoard, hiddenGameBoard, size, 3, 5);
+  setFlag(hiddenGameBoard, 6,7, &numFlags);
 
   displayGameBoardUART(hiddenGameBoard, size, numBombs, numFlags);
 
diff --git a/Minesweeper/Core/Src/spielfeld.c b/Minesweeper/Core/Src/spielfeld.c
index 08cc667..355b65f 100644
--- a/Minesweeper/Core/Src/spielfeld.c
+++ b/Minesweeper/Core/Src/spielfeld.c
@@ -174,7 +174,7 @@ void revealEmptyCells(int** gameBoard, int** hiddenGameBoard, int size, Position
     }
 }
 
-int** revealCell(int** gameBoard, int** hiddenGameBoard, int size, int row, int col) {
+void revealCell(int** gameBoard, int** hiddenGameBoard, int size, int row, int col) {
     Position pos;
     pos.row = row;
     pos.col = col;
@@ -202,15 +202,19 @@ int** revealCell(int** gameBoard, int** hiddenGameBoard, int size, int row, int
     return hiddenGameBoard;
 }
 
-void setFlag(int** hiddenGameBoard, int row, int col, int numFlags) {
+void setFlag(int** hiddenGameBoard, int row, int col, int* numFlags) {
     if (hiddenGameBoard[row][col] == FLAG_CELL)
     {
     	hiddenGameBoard[row][col] = HIDDEN_CELL;
-    	numFlags --;
+    	(*numFlags)--;
     }
-    else if (hiddenGameBoard[row][col] == HIDDEN_CELL){
+    else if (hiddenGameBoard[row][col] == HIDDEN_CELL)
+    {
     	hiddenGameBoard[row][col] = FLAG_CELL;
-    	numFlags ++;
+    	(*numFlags)++;
     }
-    return numFlags;
+}
+
+void checkWin(){
+
 }