Reversi · Game guide
Play now ↗Rules and controls
Choose default 10×10, large 12×12 or standard 8×8. Black starts. Sandwich opposing discs to flip them. A player with no legal move passes automatically. When neither can move, the side with more discs wins. Changing boards starts a new game.
Beginner strategy
A corner cannot be flipped. Be cautious with the diagonal square beside an empty corner (X-square) and the adjacent edge squares (C-squares): a careless move may give the corner away. Count your opponent's legal replies, not only the stones you gain now. Near the end, calculate the remaining moves and final count.
Solo, shared-device and online play
Gomoku, Go, chess, janggi, Othello and tic-tac-toe offer computer opponents, two-player play on one device, invitation-link online play and random matchmaking. Random matchmaking waits for another person; an immediate match is not guaranteed. Party games differ in player counts, controls and online support.
Saving and deletion
Recent games, regular 2048 and Minesweeper progress and best records stay in this browser without automatic expiry. Daily records retain the last 30 days. Gomoku saves the latest unfinished game for up to 30 days and clears it when finished or restarted. Reversi and tic-tac-toe progress is lost when closing or refreshing. Records do not transfer automatically between devices or domains.