C7 Puzzle Solution
Start at the start and just follow the red line all the way.
G9 Puzzle Solution
Start at the start and follow one of the red lines. Use the teleporter to go back to the start and then follow the other line through.
Rainbow Gate Code
Place the Stone Skulls like this at the gate to cause the center chest to appear. I believe the chest will also appear if you do the opposite with the skulls.
Redpine Crystal Cavern Puzzles
Save you some time.
There are multiple ways to complete this puzzle, this here is one: