To start all the balls are placed white side up except for the center ball, which is black.Players alternate turning over any black ball to white and then two adjacent white balls to black.The aim of this game is to isolate the white ball by surrounding a white ball with black balls. Whenever this occurs the player scores a point (turns a black ball to yellow on the edge of the board).The game finishes when neither player can move or if a player turns all the balls on his side to yellow. - BoardGameGeek