You need to use the built-in disk – plate mini gun to protect it from hordes of enemies – beetles. The disk – plate rotates at a constant speed. When you click in any area of the screen from the mini cannon projectiles fly balls. When hit the enemy – beetle that is considered to be destroyed. If the line of flight of the projectile – ball meets several enemies – beetles then they are all destroyed. When one of the enemies – beetles-reaches the disc, the game is lost.