Tic Tac Toe

Tic Tac Toe is the classic three-in-a-row, free in your browser, with an AI that scales from friendly beginner to mathematically unbeatable — plus a 5×5 four-in-a-row variant when the small board feels solved. Play solo or pass the device for hot-seat matches with a friend.

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How to play

Tap or click a square to place your mark. Line up three in a row — across, down, or diagonally — before your opponent. Choose Easy, Normal, or Hard AI, switch to the 5×5 variant for four-in-a-row rules, or toggle two-player mode to share the board.

Tips & tricks

Open in a corner, not the center, against imperfect players — it creates more traps. Answer a center opening with a corner. On the 5×5 board think like connect-four: double threats win games, single threats just get blocked.

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