Stay inside the white area, as the circle get smaller for each time you tap. In Material Circle you tap the screen to change direction of your circle. Either the circle goes inwards or outwards, and you tap the screen to change direction. Every time you tap the screen, your circle cuts the white area in smaller area. See how long you survive, and see how you perform on the leaderboard.
Only your the speed of your brain and fingers will set the limit. Material Circle game runs as long as you are in the white.
Up for a real challenge?
Circle circle on the wall, who is the fastest of them all?