Prism Canyon is a secret course in Mario & Flybro: The Mysterious Mansion. This level is a large rocky basin filled with iridescent death-juice, with parts of structures scattered throughout. There are paths following the perimeter of the level with crystals and trees dotted across them.
This course is accessed by walking onto the teleporter on the roof. Using the crates around the back of the mansion outside, platform your way up to the top of the mansion.
There is one Power Star to collect here; collect 100 coins to spawn the Star in the centre of the canyon.