Control your character with the arrows (or A, D, W) keys and use the mouse to move the pointer. The cursor allows you to create gravity wells by aiming at a target then dragging the mouse to indicate gravity direction. The character will toss a ball that will open the gravitational disturbance when it comes in contact with a wall. You can create as many wells as you have balls to toss and can re-absorb unused areas by moving the cursor over one and tapping the spacebar.