3-Up Moons are moon-like items that first appear in Super Mario World. They are shaped like moons, have eyes and a mouth, and can be found on the ground. They are extremely rare, and very difficult to get. They have a similar effect as 1-Up Mushrooms; however they give Mario or Luigi three extra lives instead of one. Also, if the player replays the level, the moon will disappear from where it was until the game is reset. Most, but not all, 3-Up Moons are only accessible if Mario or Luigi have a Cape Feather.
The 3-Up Moon
from New Super Mario Bros. U
3-Up Moons reappear in the Wii U game, New Super Mario Bros. U. They are within 3-Up Moon Blocks, a total of four 3-Up Moons can appear and only be collected with the efforts of the GamePad player and Wii Remote player(s).
 Locations in Super Mario World
 Names in Other Languages