Tic Tac Touch is a quick-and-easy web app which allows you to play tic-tac-toe without any downloads or jailbreaking necessary.
Choose 1-player or 2 player, and select among 3 levels of difficulty.
Tic Tac Touch will keep score for you at the top.
Try it out: http://www.flipside5.com/products/tictactouch/ttt/
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