World 6 is the sixth and final normal world that appears in New Super Mario Bros. 2. This world is a lava world, similar to World 8 of New Super Mario Bros. Wii and World 8 of New Super Mario Bros., the former from which it reuses its music. This world can be accessed by completing either World 5-
Castle or World 
Flower-
Warp Cannon. There are four Toad Houses in this world, two green, one red, and one yellow. There are eleven levels in this world, six of them are the normal levels, one of them is a Ghost House, one of them is a secret level and there is also a Rainbow Course, a Tower and a Castle level. This world has a total of twelve exits. Enemies introduced in World 6 include volcanic debris, Flame Chomps, Fire Bros., Crowbers, and Bowser sculptures. Bowser is the boss of this world.
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Description
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World 6- Rainbow
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The Rainbow Course, featuring coins that spin in circles and Mushroom Trampolines.
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World 6-1
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A volcano level that contains volcanic debris and POW Blocks.
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World 6- Ghost House
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This level is a maze that involves many ? Switches, Warp Doors, and moving platforms.
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World 6-2
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This level takes place in a volcano, where Mario must ride segmented platforms while avoiding enemies such as Goombas and Para-bombs.
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World 6-B
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This level contains platforms that change direction whenever he jumps on it. Mario must ride these platforms while avoiding Bullet Bills and Flame Chomps.
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World 6-3
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An underground level containing Fire Bros and Stretch Shrooms.
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World 6-A
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This level takes place in a volcano containing raising lava, platforms that sink when Mario touches them, and Dry Bones.
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World 6- Tower
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The Tower of World 6. It has several Burners, some of which are blocks that temporarily deactivate the Burners when hit. Reznors are the bosses of the tower.
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World 6-4
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A haunted level that contains many Crowbers and Lifts carried by Peepas.
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World 6-5
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This level features intermittent Seesaws, along with spiked balls and Bowser sculptures.
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World 6- Bowser Castle
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The final level in the main game. This level contains many Burners, along with the Koopalings, who can turn Mario to stone by flashing the Koopa Clown Car's eyes. Bowser is the boss of the level.
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