released under CC-BY 4.0

V2:
- balanced the hidden path
- set a new type of zipper
- fixed checklines
- added a hidden reverse cannon
- moved the ramp to the right
- zipper.png max speed increase set to 22 (from 15), speed gain set to 6.5 (from 4.5)
- added sun (ambient, diffuse, specular)

V3:
- replaced the ramp with a timed cut
- added nebula
- added a zipper
- fixed checklines
- changed some nitros and bananas
- changed screenshot

V4:
- changed the right and center path to be longer
- increased super zipper boost
- moved some checklines that could be missed
- changed the sun a bit