Use Button instead of clickable Label and add logic that prevents such a button to react to mouse actions after a move is made by any player. Tic Tac Toe Change the code to keep track of last user and computer moves separately so that the last moves of both the players are always highlighted. Add 4x4 board. This will require to connect 4 cells to form a line. Add 'Easy', 'Medium' and 'Hard' modes. Square Tic Tac Toe Add 'Medium' mode which will have algorithm based AI moves but with much better chances for the user to score a win. Write tests to find at least two different sequence of plays which will result in AI losing when the very first move is made by the user. Extend the tests to check if there's a case where the AI loses even when it makes the very first move. See if you can tweak the AI decision making algorithm to be more defensive and never lose (with/without changing the weight calculation). New game Implement Connect Four game. Implement a GUI that allows the user to choose among Tic Tac Toe, Square Tic Tac Toe and Connect Four games. Add sound effects for these projects. Keep track of number of wins/losses for the user and display them. Try to make this information persistent if the user closes the GUI window and opens again later. Coding style