World 1 (New Super Mario Bros. Wii)

Mushroom Plains is the first world in New Super Mario Bros. Wii, where the player will come across Larry Koopa , the first boss of the game.This level is similar to the first world in othergames, in that it has grassy plains and features many differing environments. The first level, 1-1, is a generic grassland level, and 1-2 is an underground level, following the tradition of mario games.