Grass Land

Grass Land (alternatively Grasslands or The Grassland ) is the first world of Super Mario Bros. 3. It has six regular levels, one Hammer Brother to encounter, one fortress, a Spade Panel, two Toad Houses, and a castle that has been taken over by an airship. In the third level, and in the fortress, Mario can get two out of the three Magic Whistles in the game. Larry Koopa, one of the seven Koopalings, guards this area and is the boss of Grass Land. The world map's natural terrain includes ground similar to that found in 1-1 and 1-3, several hills, rocks, and a moat surrounding the castle.

The king of Grass Land wears a turban, and has a beard. During the events of the game, he is turned into a dog by the Koopalings; the SNES and Game Boy Advance versions of Super Mario Bros. 3 instead see him turned into a Cobrat.

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.

Grass Land's world map theme has gone on to be arranged and included in melodies in several other games. A rendition is played on the level-up option screen in Paper Mario, the Rec Room in Super Mario 64 DS, and the 100 Mario Challenge and Course World menus in Super Mario Maker. A medley of this theme and the Super Mario Bros. overworld theme is played in Mario's Pad in Super Mario RPG: Legend of the Seven Stars and Mario & Luigi: Superstar Saga. Another medley of this music, mixed with Super Mario Bros. 3's overworld theme, can be heard on the stage Yoshi's Island in Super Smash Bros. Melee, Super Smash Bros. Brawl, and Super Smash Bros. for Wii U, and on any Mario stage in Super Smash Bros. Ultimate. One other medley of this music, mixed with the map music for World 1 from New Super Mario Bros. Wii is the world map theme for World 1 of Puzzle & Dragons: Super Mario Bros. Edition.

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.

The episodes in which this world is shown as the title card are "Reptiles in the Rose Garden", "Princess Toadstool for President", "Reign Storm", "Toddler Terrors of Time Travel", "Dadzilla", "Tag Team Trouble", "Misadventures in Babysitting", "Mush-Rumors", "7 Continents for 7 Koopas" and "True Colors"

Trivia

 * Grass Land is the only world to keep its name intact in all versions of Super Mario Bros. 3 (including Super Mario All-Stars and Super Mario Advance 4).
 * A highly similar theme is used for the Munchlax's Berry Bonanza game, on the now-defunct "Play Games" section of the Pokémon website.