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About Tic-Tac-Toe AI

This is the schoolyard classic with a twist: the computer opponent plays perfectly. Our AI uses the Minimax algorithm — it looks ahead at every possible sequence of moves before choosing its own, which means it will never make a mistake. It can't be beaten with tricks; the best you can achieve against it is a draw. That's not a flaw — it's the challenge.

Prefer a fairer fight? Switch to vs Friend mode and pass the phone back and forth. The scoreboard tracks wins for both sides, and in AI mode a streak counter records how many games in a row you've survived without losing.

How to play

• You are X and always move first. Tap any empty square to place your mark.
• Get three in a row — horizontally, vertically, or diagonally — before your opponent does.
• If all nine squares fill up with no line of three, the game is a draw.
• Use Restart Match at any time to reset the board (scores are kept).

Why can't the AI be beaten?

Tic-Tac-Toe is what mathematicians call a solved game. There are only 255,168 possible ways a game can play out, which is few enough for a computer to examine completely. The Minimax algorithm assumes both players play optimally and picks the move with the best guaranteed outcome. Since perfect play by both sides always leads to a draw, a perfect AI can never lose — but neither will you, if you play accurately. Getting a draw every single game is beating the machine.

The interesting part is playing as the second-guesser: every time you win a streak of draws, you're proving you can match a computer's flawless play. One slip — taking an edge when you should take a corner, missing a fork — and the AI punishes it instantly. We break down the full theory in our guide to beating (well, drawing) the Tic-Tac-Toe AI.

Quick strategy guide

1. Open in a corner or the centre. The centre square touches four winning lines, corners touch three, edges only two. Never open on an edge.
2. Block forks before they form. A fork is a position that threatens two winning lines at once — the classic trap is two opposite corners. If your opponent has two corners and the centre is yours, respond with an edge, not another corner.
3. Think one move ahead, always. Before placing, ask: "after this, can my opponent create two threats at once?" If yes, choose differently.
4. Against a human, vary your openings. People learn patterns fast — an unexpected corner switch is where most human-vs-human wins come from.

Tic-Tac-Toe FAQ