The classic disc-flipping board game (Othello-style) on an 8×8 grid: outflank your opponent's discs to flip them to your color. Legal squares are marked. Most discs at the end wins. Three CPU strengths; if you can't move, your turn is auto-passed.
Reversi
The classic disc-flipping board game (Othello-style). Outflank to flip discs and beat the CPU at three strengths — most discs wins.
📖 How to Play
- Pick a strength (Easy/Medium/Hard) and your side (Black=first, White=second) to start
- Legal squares are marked — tap one to place a disc
- Opponent discs trapped between your new disc and your existing discs flip to your color
- Flips happen in all 8 directions at once
- If you have no legal move, your turn is auto-passed
- When neither side can move the game ends; the most discs wins
- Score from strength, result, and disc margin feeds the global leaderboard
About this game
Reversi is played on an 8×8 board: place a disc so that it traps your opponent's discs between yours, and every trapped disc flips to your colour. Widely known as Othello, it's a staple strategy game — whoever has more discs at the end wins.
The rules are simple but the strategy runs deep, and it's famously counter-intuitive: taking lots of discs early usually hurts you by shrinking your own options. The four corners can never be flipped, which makes winning them the single biggest factor in most games.
The CPU comes in three strengths (Easy, Medium, Hard) and uses minimax search to look ahead. You can also choose to play first (Black) or second (White), so the same opponent produces different games. Legal moves are highlighted and flips are shown with a 3D animation.
Tips & strategy
- The four corners can never be flipped — take them whenever you legally can
- Don't grab discs greedily in the opening; holding fewer discs usually means more options and a better position
- Avoid the squares diagonally adjacent to a corner — playing there is the usual way you hand the corner to your opponent
- Reducing your opponent's legal moves can force them to pass late in the game, which is often decisive
- In the endgame every move swings the count sharply, so start counting carefully as the empty squares run out
- Late swings are common — don't read too much into who has more discs early on
FAQ
Q. Is this the same as Othello?
A. It's the same disc-flipping board game, implemented independently for this site and free to play with no signup.
Q. Can I choose the CPU strength?
A. Yes — Easy, Medium or Hard. The AI uses minimax lookahead, and Hard is genuinely challenging.
Q. Can I play first or second?
A. Yes, you can start as Black (first) or White (second).
Q. What happens if I can't move?
A. If you have no legal move, your turn is passed automatically. When neither side can move, the game ends.
Q. How strong is the CPU?
A. On Hard it searches several moves ahead with minimax and will punish a loose move by taking a corner. Starting on Easy is the best way to learn why corners matter.