Another small tip for controlling the ball in Rolly Vortex is not to remove your finger from the screen - at all. Lifting your finger is tempting, but when you put your finger down once again to make minor adjustments to your trajectory, it might take your device a hot moment to register your press, and if it thinks you've moved slightly, it might put the ball in harm's way. Best advice is to just not lift your finger off, unless you're absolutely certain it's not going to be hitting anything while you scratch your nose.