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World 1 is the first world in New Super Mario Bros.. It is a grassland-themed world with enemies such as Goombas, Koopa Troopas, and Cheep-Cheeps. This world also introduces the game's new power-ups, the Mega Mushroom, Mini Mushroom, and Blue Shell. Bowser Jr. and Bowser are fought here at the Fortress and the castle respectively. There are eight levels in the world, with four along the standard path, one along a split path, and the Castle/Fortress level. There are five Toad Houses: two power-up houses, one Mega Mushroom house, and two life houses. In addition, when the player beats the game, another blue Toad House appears, in which the player can buy and swap wallpapers for the touch screen while on the World Map.
World 1 also appears as a background for Dream Figure Skating in Mario & Sonic at the Olympic Winter Games.
Level Information
| Level | Preview | Description |
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| World 1-1 | 
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The first level in New Super Mario Bros. is a meadow with flowers, bushes, and mushrooms scattering the land. Peach's Castle is visible in the background for the first portion of the level. Read more... |
| World 1-2 | 
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This is the second level in the world, and the first underground level which introduces Piranha Plants. It has a secret exit which unlocks a different path that directly leads to the tower of that world. Read more... |
| World 1-3 | 
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This is the third level in the world, and the first sky-themed level. It introduces Spin Blocks and Red Ring. In the level, there are quite a few tilting Mushrooms. Read more... |
World 1- Tower
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This is the first tower in the game which introduces Dry Bones. It has a secret exit which unlocks the World 1- Cannon. Read more...
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| World 1- Cannon
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This area can be unlocked by using the secret exit in World 1- Tower. The area contains a cannon in the middle of the grassland. If the player enters the cannon, he or she will be launched to World 5, which can be seen in the background.
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| World 1-4 | 
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This level is a grassy meadow, much like World 1-1. It introduces the Mini Mushroom. Read more... |
| World 1-5 | 
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This level contains lots of pink-colored bouncy mushrooms. Read more... |
| World 1-A | 
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This level is the first underwater level in the game. This level introduces Sushis and Cheep-Cheeps. It is the first and only secret level in World 1. Read more... |
World 1- Castle
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This level is the first Castle level in the game, and the last level in World 1. The majority of the level consists of walking on tightropes over lava. This level introduces Podoboos. Read more... |
Enemies Introduced
- Bowser
- Koopa Troopa
- Goomba
- Dry Bones
- Super Dry Bones
- Podoboo
- Cheep-Cheep
- Piranha Plant
- Koopa Paratroopa
- Sushi