How to play Reversi
Play Reversi online on an 8×8 board: place a disc so that it outflanks a line of your opponent’s discs, and they all turn to your colour; when the board is full or neither side can move, the side with more discs wins. Play the computer (easy, normal or hard, as black or white) or a friend on one device; the squares you can play carry a dot, with undo and your game saved. Free, no ads.
- Controls
- Click a square with a dot to place a disc; before a game, choose the computer or two players, the level and your colour
- Features
- Disc counts; the moves you have marked; automatic passes; the winner at the end; undo; the game is saved
- Processing
- Runs in your browser, the computer player included; nothing is uploaded
- Choose “Computer” or “Two players”; against the computer, choose a level and your colour (black moves first).
- A disc must outflank a line of your opponent’s discs between it and one of yours, across, down or diagonally; the outflanked discs turn to your colour. The squares you can play carry a dot.
- A side with no move passes by itself; when neither side can move, the game ends and the side with more discs wins.
FAQ
When do I pass?
When no square lets you outflank any of your opponent’s discs, you must pass and your opponent plays again; the game passes for you and says so. When neither side can move, the game is over.
How strong is the computer?
Easy weighs the squares and discs a move takes, with some chance; normal looks four moves ahead; hard searches as deep as it can in about a second and plays the last dozen or so moves out exactly. In self-play tests, normal and hard both beat easy every time.
How does undo work?
Against the computer, undo goes back to before your last move, taking back its reply as well; with two players it takes back one move.
Do I need an account or a connection?
No. The game and the computer’s thinking run in your browser, and nothing is uploaded.