Reversi starts with four pieces in the center: two black and two white on alternating diagonals.
Black moves first.
- On your turn, place one piece on an empty square.
- Your move must trap one or more opponent pieces in a straight line: horizontal, vertical, or diagonal.
- Any trapped opponent pieces flip to your color immediately.
- If you cannot make a valid move, your turn is skipped.
- The game ends when neither player has a valid move.
- The player with more pieces on the board at the end wins.
Gold dots mark the valid moves for the current player.