Black2
2White

Reversi vs Computer

Five levels from Easy to Master. Black moves first.

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Play Reversi Against the Computer — Free, 5 Difficulty Levels

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How to Beat the Reversi AI

The AI evaluates every position using the same principles strong human players use. Understanding those principles is the fastest way to win more games.

Take every corner immediately. Corners (the four squares at the board’s edges) can never be flipped. The AI will always take a corner when available — so should you.

Avoid X-squares against empty corners. The diagonal squares next to each corner (b2, b7, g2, g7) are traps. Playing one when the adjacent corner is empty gives the AI a free corner next turn.

Keep your disc count low early. Flipping many discs in the first 30 moves is a beginner mistake. Fewer discs means fewer targets for the AI and more flexibility for you.

Start on Easy, move up gradually. Beat Easy 7 out of 10 games before switching to Medium. The jump between levels is significant — rushing to Hard too soon teaches bad habits.

Difficulty Guide

LevelBest For
EasyFirst-time players learning the rules
MediumPlayers who know corners and X-squares
HardIntermediate players ready for mobility and edge strategy
ExpertAdvanced players studying endgame and parity
MasterCompetitive players — plays near-optimal Reversi

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Frequently Asked Questions

How do I play Reversi against the computer?

Select your preferred difficulty level and press Start. The AI plays White and you play Black. Place discs to bracket and flip your opponent’s pieces. The player with the most discs when no moves remain wins.

How many difficulty levels are there?

There are 5 difficulty levels: Easy, Medium, Hard, Expert, and Master. Easy is suitable for first-time players. Medium applies core strategy (corners, mobility). Hard and above play near-optimal Reversi and will challenge experienced players.

Can I undo a move?

Yes. Use the Undo button to take back your last move and try a different one. This is especially useful for learning — try a move, see how the AI responds, then undo and test alternatives.

How do I get better at Reversi against the AI?

The fastest improvement comes from three habits: always take corners when available, never play the diagonal square adjacent to an empty corner (the X-square), and keep your disc count low in the first 30 moves. Start on Easy and move up a difficulty level once you’re winning 7 out of 10 games.

Is the computer Reversi game free?

Yes — completely free. No download, no account, no time limits. Play as many games as you like directly in your browser.