Dark Green = jump through (Down arrow to drop) orange = climbing wall/water dark blue = trampoline jumping through holes will teleport you to the other side and change gravity.
Other platformer engines: WALL JUMP: https://scratch.mit.edu/projects/211958643/ SIMPLE: https://scratch.mit.edu/projects/154592922/ PORTAL: https://scratch.mit.edu/projects/201906282/ ADVANCED: https://scratch.mit.edu/projects/155108778/