Tic-Tac-Toe Prime

Tic-Tac-Toe Prime is a free online board game you can play right here in your browser — no download, no sign-up. The classic game of X and O, reimagined.

How to play Tic-Tac-Toe Prime: The classic game of X and O, reimagined.

Controls: Click or tap a piece to select it, then click or tap a highlighted square to move; the game marks legal moves for you.

Strategy: Think a move ahead of your opponent: control the centre, develop all your pieces before attacking, and avoid trades that only help the other side.

Tip: Before every move, ask what your opponent threatens next — defending in time wins more games than flashy attacks. Use the “Fullscreen” button for the best experience.