Tic-Tac-Toe

How to play

You're X, the computer is O. Take turns placing your mark; the first to get three in a row (across, down, or diagonally) wins. If the board fills up first, it's a draw. You and the computer take turns going first.

• Easy: the computer plays randomly.
• Medium: it takes a win when it sees one and blocks yours.
• Hard: it plays perfectly. The best you can do is a draw.