Grey Mountains is the 9th level of Special World. It is unlocked via completing 9-8: Purple Sewer and finishing that will unlock 9-10: Black Clappers. This level is based on SM64's Cool Cool Mountain level as there is snow in this level. This is the Angry Sun and Angry Moon's final appearance.
- Before the checkpoint, toss a nearby Koopa Shell at it*.
- When at the frozen coins section, you'll need to melt the ice to access it**.
- Shortly after, you'll need to be Super Mario to break the blocks blocking it***.
*You can't get it yourself.
**If you don't have a Fire Flower, you'll have to lure the Angry Sun to do it for you.
***A Super Mushroom can be found in that ?-Block.