Foos are a new cloud enemy in New Super Mario Bros. Wii. They are clouds with eyes and mouths. Foos first appear in World 7 (NSMB Wii), but in only one level- World 7-5. When Foo spots Mario, it creates fog that makes it hard to see what's going on. Mario can get rid of the fog by spinning, but if he has the Propeller Mushroom's (Propeller Suit) effect, he can get rid of it faster by propelling. Foos can be defeated in every possible way in the game (jumping on their heads, throwing a fireball, running into them with Starman, etc). However, some Foos are in places Mario cannot access.