Play vs the computer or pass-and-play with a friend.
A fast, no-download version of the classic pen-and-paper game, playable against a computer opponent or a friend sharing the same screen.
Take turns placing your mark in an empty square. Get three in a row — horizontally, vertically, or diagonally — before your opponent does.
Tic-tac-toe is a solved game: with perfect play from both sides, every match ends in a draw. If you go first, taking the center square gives you the strongest position; if you go second and the center is taken, a corner is your best reply.