Fun and games

The cleanest version of a solved classic.

Play head-to-head on one device or switch on computer mode for an unbeatable AI. Scoreboards stay saved locally, rematches are instant, and number keys 1 through 9 can place moves if you prefer the keyboard.

Two ways to play Swap between local two-player and computer mode anytime.

Unbeatable computer The AI uses minimax, so sloppy openings get punished fast.

Saved scoreboards Wins and ties stay in your browser until you clear them.

Mode

Your mark

You 0

Ties 0

Computer 0

Current turn: X

Round type: Computer

Opening mark: X

How to use it

1. Pick your setup Computer mode gives you a solo game. Two-player mode turns the board into a local pass-and-play match.

2. Make your move Click a square or use keys 1 to 9. Top row is 1 2 3, middle is 4 5 6, bottom is 7 8 9.

3. Run it back New Round keeps the scoreboard. Clear Scores wipes both scoreboards and starts fresh.

What is tracked

Computer mode Human wins, computer wins, and ties are stored separately from local two-player results.

Two-player mode X wins, O wins, and ties stay grouped under the shared board scoreboard.

AI behavior The computer evaluates every legal line before choosing. It will not intentionally blunder.