The game involves a ball and four straight walls of different colors surrounding it. The objective is to bounce the ball against the walls, but it can only bounce against a wall of the same color. The player earns a point each time the ball bounces against the correct wall, and the ball changes color with each bounce. If the ball hits a wall of a different color or goes out of bounds, the game ends. The player must move the walls to make the ball bounce against the correct wall and score points.