Place a black disc so it traps a line of white discs between two black ones — they all flip. Most discs wins!
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You Win!
How to Play Reversi
Goal: finish with more discs of your color (Black) than the computer (White) when the board is full or no one can move.
Setup: the four center squares start with two black and two white discs.
Your move: place a black disc on a glowing square. A move is only legal if it outflanks at least one straight line (horizontal, vertical, or diagonal) of white discs, capped at both ends by black.
Flipping: every white disc you trap between your new disc and another black disc flips to black.
Passing: if you have no legal move, your turn is skipped automatically. The same goes for the computer.
Game over: when neither side can move, the player with the most discs wins.
Tip: corners can never be flipped, so grabbing them is powerful. Be careful giving your opponent access to them!
About Reversi (Othello)
Reversi — also known as Othello — is a game of constant reversals on an 8×8 board. Place a disc so it traps a line of your opponent's discs between two of yours, and every disc in that line flips to your color. The lead swings back and forth right up to the final move, so a losing position can turn in an instant. Play against the computer at three difficulty levels, with a built-in how-to-play guide if the rules are new to you. It works with touch or mouse, needs no sign-up, and suits ages 8 and up. Easy to learn but genuinely deep, it's a great workout for strategy, foresight, and reading the board.