Tap-n-Twist

Guide the smaller circle through the field of larger circles for as long as you can.

In easy mode the circle moves up and down only. Tapping the screen will increases the maximum distance the circle will move and also reverse it's up/down direction.

In hard mode the circle moves in a spiral like motion. Tapping the screen will increases the maximum distance the circle will move and also reverse it's clockwise / anti-clockwise direction.