The track is a trefoil knot drawn on the inner wall of the tube: twice around the ring, three times through the cross-section. One lap is one full knot. You will see every corner you have ever taken hanging overhead.
3 laps · beat the clock, then beat your ghost · yellow orbs are boost · the walls are low — a brave Shift + Space jump crosses the tube itself
W throttle · A/D or mouse steer · S brake · Space jump · Q auto-drive · F view · R restart