You're a ball rolling down the inside of an endless tunnel. Drift freely left and right at any time — on the ground or in mid-air — and the camera rotates to make a neighboring wall the new floor only when the ball physically touches that wall. Jump has long, low-gravity hangtime, so use it to glide over gaps. Watch for crumbling tiles, ice, and conveyors. Between stages the tunnel becomes a clean regular connector tube while a LEVEL banner rolls by, then reshapes into a true square, pentagon, hexagon, or octagon. Later levels add wider empty bands of missing tiles that force longer jumps.