World 8 is the final world of New Super Mario Bros. Mario and Luigi travel to this world after defeating Monty Tank or Lakithunder, or using the World 8 cannon in World 5. This world is divided into two parts: a "dark forest" area, and a "lava" area; both having their separate Towers and Castles. The two bosses of this world are Dry Bowser; and a resurrected Bowser fighing along with Bowser Jr.
Unlike all the other worlds, this world does not feature secret exits or unlockable courses.
Level description
| Level | Preview | Description |
|---|---|---|
| World 8-1 | 
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An overworld level featuring Crowbers and Bullet Bills. Read more... |
| World 8-2 | 
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An underwater level featuring controllable water and Skeeters. Read more... |
World 8- Tower
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A tower level featuring moving walls and spikes. Read more... |
| World 8-3 | 
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Another underwater level featuring Unagis and a Mega Unagi. Read more... |
| World 8-4 | 
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An overworld level featuring moving platforms and numerous amounts of Scuttlebugs. Read more... |
World 8- Castle
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A castle level featuring controllable lifts. Read more... |
| World 8-5 | 
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A short level which takes place inside a volcano. Read more... |
| World 8-6 | 
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A wrap-around level taking place inside a volcano, featuring rising lava. Read more... |
| World 8-7 | 
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An overworld level with multiple varieties of Hammer Bros. Read more... |
| World 8-8 | 
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The last normal level of the game; an overworld level featuring Volcanic Debris and Kab-ombs. Read more... |
| World 8- Tower 2
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The last tower level of the game; a tower featuring Snake Blocks and Fire Bars. Read more... |
World 8- Bowser's Castle
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The final level of the game; a large castle level featuring switches that can invert rooms. Read more... |
Enemies introduced
Trivia
- When Mario enters the second part of World 8, additional drums and a double-reeded flute are added while roaming in the map.