It is a grassland located in the Mushroom Kingdom. It is mostly inhabited by Little Goombas and Koopa Troopas. It consists of an overworld course, an underground course, a treetop course, and the castle.
On the world map from Deluxe, it features several trees, two pipes, some rocks, and a body of water. Located on the far west is 1-1. Just east of it is 1-2, which sits next to a pipe that will lead the player to another pipe on the south end. East of the second pipe is 1-3, which is situated on a small piece of land in the water. The castle sits just ahead of it.
|1-1||This is the first overworld course in the game and the first course overall. Enemies in this level consist of Little Goombas and Koopa Troopas. The player is given a time limit of 400 seconds.|
|1-2||This is the first underground course in the game. Enemies consist of Little Goombas, Koopa Troopas, and Piranha Plants. The player is given a time limit of 400 seconds.|
|1-3||This is the first treetop course in the game. Enemies consist of Little Goombas, Koopa Troopas, and a few Koopa Paratroopas. The player is given a time limit of 300 seconds.|
|1-4||This is the castle level of this world, and overall the very first castle course in the game. The only ordinary enemy here is the Fire-Bar. However, the boss of this level is a Little Goomba masquerading as the fake Bowser. The player is given a time limit of 300 seconds.|
- All levels in this world were made available in Super Mario Advance 4: Super Mario Bros. 3 as e-Reader levels. Before the game was released for Wii U, only the first level was available worldwide.
|Characters||Protagonists||Mario • Luigi|
|Supporting characters||Bowser • Fake Bowser|
|Supporting characters||Princess Toadstool • Mushroom Retainer|
|Enemies||Enemies||Blooper • Bullet Bill • Buzzy Beetle • Cheep-Cheep • Firebar • Goomba • Hammer Bro. • Koopa Paratroopa • Koopa Troopa • Lakitu • Piranha Plant • Podoboo • Spiny|
|Items||Items||1 up Mushroom • Coin • Fire Flower • Magic Mushroom • Starman • Poisonous Mushroom|
|Worlds||World 1||World 1-1 • World 1-2 • World 1-3 • World 1-4|
|World 2||World 2-1 • World 2-2 • World 2-3 • World 2-4|
|World 3||World 3-1 • World 3-2 • World 3-3 • World 3-4|
|World 4||World 4-1 • World 4-2 • World 4-3 • World 4-4|
|World 5||World 5-1 • World 5-2 • World 5-3 • World 5-4|
|World 6||World 6-1 • World 6-2 • World 6-3 • World 6-4|
|World 7||World 7-1 • World 7-2 • World 7-3 • World 7-4|
|World 8||World 8-1 • World 8-2 • World 8-3 • World 8-4|