Grass Land

Grass Land is the first world of Super Mario Bros. 3. It has six levels, one Hammer Brother to encounter, one fortress, a Spade Panel, two Toad Houses, and a king's palace that has been taken over by an Airship. In the third level, and in the fortress, Mario can get two out of the three Warp Whistles in the game. Using them one after the other allows him to take a shortcut to World 8, Dark Land. Larry Koopa, one of the seven Koopalings, guards this area and is the boss of Grass Land.

The world map included in Super Mario Advance 4: Super Mario Bros. 3 shows that Grass Land is bordered by Desert Land to the south and Pipe Land to the east. Likewise, the opening implies that Grass Land is in close proximity to the Mushroom Kingdom.

The Adventures of Super Mario Bros. 3
In The Adventures of Super Mario Bros. 3, Grass Land does not make an explicit appearance; however, its map shows up as the opening curtain when the Mushroom Kingdom is the episode's main setting, implying them to be one and the same or at least its animated equivalent. The Mushroom Kingdom (also sometimes called Mushroomland) appears in almost every episode at some point, as it was where Mario and his friends live. Mario and Luigi live in Toad's house, while Princess Toadstool lives in the Mushroom Castle.

Trivia

 * A rendition of the theme for Grass Land is played on the Level Up Option Screen in the game Paper Mario. The same applies to the Minigame Room in Super Mario 64 DS and the 10 Mario Challenge in Super Mario Maker.
 * Another rendition of the theme is used for Munchlax's Berry Bonanza game, on the Pok&#233;mon website.
 * A medley of this theme and the Super Mario Bros. overworld theme is used for the theme of Mario's Pad in Super Mario RPG: Legend of the Seven Stars and Mario & Luigi: Superstar Saga.
 * Despite being called Grass Land, most of the terrain appears to be sand. It could, however, be dried grass, which is tan in color.
 * Grass Land is the only level in Super Mario Bros. 3 to retain its NES/SNES name in Super Mario Advance 4.