About this game
Tic-Tac-Toe is the world's most universal pencil-and-paper game: two players take turns marking a 3×3 grid, and the first to get three of their marks in a row — horizontally, vertically or diagonally — wins. Simple as it looks, it's many children's first encounter with strategic thinking: threats, blocks, and forks.
This version offers two modes. In two-player mode, share the screen with a friend. In AI mode you face a flawless opponent powered by the minimax algorithm — it has examined every possible future of the game and will never lose. Your realistic best against it is a draw; achieving one every time means you've truly mastered the game.
How to play
- You are ✕ and move first; tap any empty cell.
- Get three in a row (any direction) to win.
- Block your opponent's two-in-a-row, or they'll win next turn.
- Switch between 'vs AI' and '2 Players' mode any time; the scoreboard tracks the session.
Tips & strategy
- Best opening is a corner: it creates the most fork opportunities.
- If your opponent opens in a corner, take the center — anything else can lose.
- Watch for forks (two threats at once) — they're the only way anyone ever wins.
- Against the AI, play for the draw and count it as a win.
Frequently asked questions
Can the AI be beaten?
No — it plays mathematically perfect moves via the minimax algorithm. Tic-tac-toe is a solved game: with perfect play by both sides, every game is a draw.
Why learn a game that always draws?
Because humans aren't perfect. Learning why it draws — threats, blocks, forks — is a miniature course in game theory that transfers to far deeper games.
Who moves first, and does it matter?
✕ moves first. First player can never lose with correct play, and has more chances to win if the opponent slips.