Tic-Tac-Toe - Xs & Os

The Ultimate Tic-Tac-Toe App
Tic-Tac-Toe - Xs & Os is a great game to play for amateurs and advanced players.
-1 and 2 player modes
-Play the computer on easy or hard difficulty
-Play a friend in Co-Op mode
-Players can choose X or O
-Players choose which piece is first
-Option to alternate who's first each game
-Enter custom names
-Keeps score of consecutive games
-Undo function allows backtracking to try different approaches
-Every action is automatically saved, games can be continued at another time
Are you good enough to beat the computer on hard?