STRATEGY · Xs & Os

Tic Tac Toe

Start on the classic 3×3 board. Challenge the computer, pass the device to a friend, or open today’s verified three-position Daily.

Series0–0

You0Draws0Computer0TurnX

Your turn. Tap any square.

CleanStandard mixes tactics with variety.

Board & match optionsclassic first · larger boards when you want them

BoardWin lineMatchFirst move

Classic 3×3 Expert and Hint use exhaustive minimax. Larger-board computer play uses depth-limited local search and is intentionally not labeled perfect.

Daily Tic Tac Toe · 365verified 3×3 positions · local streak

3/3CompleteIn progress

Each date deterministically maps to three legal 3×3 positions with a unique exhaustive-minimax best move. No population ranking is inferred.

Local record & replayseries · recent rounds · last game

How to play & strategyrules below the game, not above it

1 · TAKE THE CENTERCenter touches four winning lines on 3×3.

If it is open, center is usually the strongest reply to a corner opening and the most flexible first move.

2 · WIN OR BLOCKCheck immediate threats before planning.

On every turn, first see whether you can complete a line. If not, stop any opponent line that would finish next move.

3 · CREATE TWO THREATSA fork forces a mistake-free opponent to defend two lines.

Classic 3×3 is solved: perfect play from both sides ends in a draw. Expert mode uses exhaustive search over legal continuations.

Tic Tac Toe

Tic Tac Toe board