Fun
Reversi
A quiet battle for the board. Trap a line of discs, flip them to your color, and finish with the majority.
Black to move
4 legal movesPlace a disc on a dotted square to trap the other color between your discs. Every trapped line flips. The player with more discs at the end wins.
Play and explore in your browser. No account needed.
Frequently asked questions
Which moves are legal in Reversi?
A move must trap at least one opposing disc in a straight horizontal, vertical or diagonal line, ending at one of your own discs. Empty squares break the line. Dots show every legal move for the current player; simply touching one of your own discs is not enough.
Why did I get two turns in a row?
The other player has no legal move and must pass. This is automatic, and a message identifies the player who passed. A player cannot choose to pass while a legal move exists. The game can finish with empty squares if neither player can move.
How do the computer levels differ?
Casual evaluates the position after one move. Standard looks three moves ahead, and Challenging looks four moves ahead, counting both sides' moves. The evaluation weighs corners, available moves and disc positions. It is a practice opponent, not a tournament-strength engine.
Can I take back a computer turn?
Yes. Undo turn returns to your previous decision point, removing the computer reply when there was one. In two-player mode it removes one move. Switching play mode starts a fresh board; changing computer level keeps the current game.
What is a good beginner strategy?
Look for corners, because a disc placed in a corner cannot be flipped. Be careful with squares beside an empty corner: they may let your opponent take it. Early in the game, leaving the other player fewer legal choices is often more useful than collecting the most discs immediately.
About this tool
Reversi turns a small set of rules into a different position after almost every move. A single disc can flip several lines at once, so an apparently comfortable lead can disappear quickly. Count discs to judge the final result, but examine which moves remain available when planning your next turn.
The board begins with four central discs and black to move. Legal positions are calculated in all eight directions. Passes, multiple-direction captures, a full board and an early finish with empty squares are handled by the same rule engine, so two-player games and computer games follow the same rules.
Use Casual to learn how captures work, then move to Standard when you begin noticing corners and mobility. The undo button is useful for testing an idea: try a move, see the reply, undo the turn and compare another approach. Challenging searches an extra turn ahead and can take a moment on slower phones.
Two-player mode is for people sharing one phone, tablet or computer. It does not create an online room or connect to another device. The game runs in this tab, without a sign-in; leaving or reloading the page starts a new board.
Updated · Novpix LLC
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