The object of the game is to make your pieces constitute a majority of the pieces on the board at the end of the game, by converting as many of your opponent's pieces as possible.

During their turn, players move three of their pieces either one or two spaces in any direction. Diagonal distances are equivalent to orthogonal distances, i.e. it is legal move to a square whose relative position is two squares away both vertically and horizontally. If the destination is adjacent to the source, a new piece is created on the empty departure square. Otherwise the piece on the source moves to the destination. After the move, all of the opponent player's pieces adjacent to the destination square are converted to the color of the moving player. Players must move unless no legal move is possible, in which case they must pass.

The game ends when all squares have been filled or one of the players has no remaining pieces. The player with the most pieces wins. A draw may occur when the number of squares are even, either from non playable squares or non standard sizes having an even number of squares. Some versions also implement the threefold repetition rule from chess.