Play Reversi, a strategic board game where you flip your opponent's pieces. Plan your moves to control the board and claim victory.

Placing Pieces
Players are designated Black and White at the start of the game. Beginning with Black, each player in turn places one disc onto a vacant square on the board.
Once placed, a disc never moves, though it may be "flipped" when captured so that it changes color.
To place a disc, simply tap on a legal square. A move is legal if it captures one or more of the opponent's discs. You can see which moves are legal by the small opaque circles on the board:
Capturing
A disc, or an unbroken line of discs of the same color, is captured when it becomes flanked on opposite ends by two opposing pieces, one of which must be the disc that was just placed on the board.
For example, if the Black player is about to place a black disc in the space with the yellow dot:

Doing so will capture and flip the horizontal white discs to black, resulting in:

Captures may be made along ranks (horizontal rows of squares), files (vertical rows of squares), or diagonals.
Endgame
A player who cannot make a legal move loses his or her turn. The game continues until neither side can move; usually, this does not happen until the board is entirely filled.
The player whose color is up on more of the discs at the end is the winner (you'll see the score next to each player's name). If both players have the same number of discs of their color up, the game is a draw.