Just when you get the hang of rolling the ball through hairpin turns, around crates and up steep inclines, they up the ante with a razor-thin track, banked ramps and stop on a dime floating platforms. There are high-speed descents, scattered obstacles requiring thread the needle maneuverability, daredevil jumps and unseen dangers ready to throw you off course at every turn. Miscalculate the speed and momentum or be too slow slamming on the brakes and your ball winds up in the purple abyss.