Reversi

Trap and flip discs on the classic 8×8 board. Play the computer on Normal or Hard, or a friend on one device.

Reversi

The classic disc-flipping strategy game on an 8×8 board. Trap a line of your opponent's discs between two of yours and they all flip to your colour. Whoever has more discs when neither player can move wins.

Play the computer on Normal or Hard, or play a friend on one device.

How to play

1. Choose Play the computer or Two players, one device.
2. Against the computer, pick a level (Normal or Hard) and your colour (Black, White or Random),

then press Start.

1. Tap a highlighted square to place a disc. Every line of opponent discs you trap flips at once.
2. Black moves first, and the players take turns.

Rules

• The game starts with white discs on d4 and e5 and black discs on e4 and d5.
• A move must trap at least one straight line of your opponent's discs (across, up and down, or

diagonal) between the new disc and another of your discs. All trapped discs flip.

• If you have no legal move, you pass and your opponent moves again. Passing is automatic and the

game announces it.

• The game ends when neither player can move. The player with more discs wins; equal counts are a

draw. A player may also resign (it asks for a second tap).

Playing modes

Play the computer, Two players, one device

Players, You against the computer, Two people take turns on one screen

Colours, Black, White or Random, Black moves first

Take back, Your last move and the computer's reply, One move at a time

Next game, New game (change level or colour) or Play again, New game

Computer levels

Level, Looks ahead, Endgame, Style

Normal, 3 moves, No special endgame search, Sometimes picks among moves of nearly equal value

Hard, 8 moves, Last 14 empty squares calculated perfectly, Always plays its best move

The computer thinks on your own device, in the background, so the board never freezes. It looks a fixed number of moves ahead rather than thinking for a fixed time, so it plays the same way on every device. There is no score, rating or ranking: every game is a friendly match.

Controls

Action, Mouse and touch, Keyboard

Place a disc, Tap a highlighted square, Arrow keys, then Enter or Space

Show or hide the hints, Show legal moves switch, Tab to the switch, then Space

Undo, Take back, Tab to the button, then Enter

The board shows both disc counts, the last move (an amber dot) and every pass. Animations and sound can be switched off at the top of the game; animations start switched off when your device asks for reduced motion. Interface languages: English, Korean, Japanese and Chinese.