Classic Tic-Tac-Toe

The 3×3 original. Pick a mode and difficulty, then start playing.

Quick tips

• Take the center first if you go first — it's part of more winning lines than any other square.
• Corners beat edges. Each corner is in 3 winning lines; each edge is in only 2.
• Always block. If your opponent has two in a row, blocking is mandatory.
• Create a fork. A position where you threaten two wins at once — your opponent can only block one.

Want to go deeper? Read the full strategy guide or learn how the AI thinks in the minimax explainer.