The walls will move when they hit by the ball. The gate will be open when you move 1 wall in Easy, 2 in Normal, and 3 in Hard mode.
Use the right side of the screen to rotate the ball. Swipe down to rotate clockwise, swipe up for counterclockwise.
Use the left side of the screen to shoot the ball. Hold down until the bar is full.
More walls used, more points gained.
Minor improvements
9Apps 4.9
