Keep in the circle, like the name says, try to keep the ball inside the circle.
If you like Ping Pong Type of game , then this game is just like the circle pong.
Simple game with simple rules. Just touch the right side of the screen to rotate anti-clock wise and the left side for clock wise rotation.
Also as your point goes up, i hide some important world the will be reveal as your score goes higher.
Please No SPOILER ;)