Two mazes, one strip: maze A is printed on the near face, maze B on the far face. Roll off the end of A and the twist carries you onto B, upside down. Finish by coming back to the same portal you started from, two laps later.
Move: arrows / WASD, or the on-screen pad. Steering is relative to your view, so nothing inverts when you flip sides.
Camera: CHASE rides the strip (wheel / pinch to zoom). FREE = drag to orbit.
Checkpoints: 10 gates; passing one seals the corridor behind you.