World 4 (New Super Mario Bros.)
- “World 4 is a lush forested landscape teeming with life. Unfortunately, most of the forest inhabitants are far from friendly. Before you make it through the forest, you'll have to navigate your way through the mind-bending World 4 Ghost House.”
- —Official website
World 4 is an alternate world found in the game New Super Mario Bros. This world is mainly jungle-based, and features a type of purple colored toxic water, which kills Mario and Luigi with a single touch - regardless of what form they take.
This world is accessible by defeating Mummipokey from World 2 in Mini Mario form. World 4 introduces a lot of new enemies, such as Wigglers and Scuttlebugs. It also introduces Dorrie - a friendly creature who helps the Mario bros. travel along the toxic water. As with all the other worlds, Bowser Jr. is fought here. The boss of this world is Mega Goomba, and defeating him will lead the player to World 5.
If the player looks closely on the world map, when Mario walks on the secret path from 4-1 to the 1-Up house, he appears to walk backwards on one of the sections.
Level Information
| Level | Preview | Description |
|---|---|---|
| World 4-1 | 
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The first level in World 4. This level introduces Poisoned Water, and the player must use Dorrie to cross it. Read more... |
| World 4-2 | 
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This is the second level in the world. It is the only sky level in the world, and mostly takes place on tilting mushrooms. Read more... |
| World 4-3 | 
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This is the third level in the world, and takes place underwater. It introduces Unagi and Mega Unagi. Read more... |
World 4- Tower
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This is the fourth tower in the game. Lava is constantly rising upwards. Read more... |
| World 4-A | 
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This is the world's only secret level. It is covered in Poisoned Water. Read more... |
| World 4-4 | 
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This level contains many Wigglers. Read more... |
World 4- Ghost House
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This level is the second Ghost House in the game. Read more... |
World 4- Cannon
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This area can be unlocked by using the secret exit in World 4- Ghost House. If the player enters the cannon, they will be taken to World 7, which can be seen in the background.
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| World 4-5 | 
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This level takes place underground. It contains many Bob-ombs. Read more... |
| World 4-6 | 
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In this level, Mario must use Dorrie to cross the Poisoned Water again. Read more... |
World 4- Castle
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This level is the fourth castle level in the game, and the last level in World 4. It contains many swinging platforms and Thwomps. Read more... |
