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Crystal Caves, or World D, is the fourth secret world of Newer Super Mario Bros. Wii. It is unlocked by completing the secret exit in World 5-8: Magma Iceburrow. This world has two exits. Completing the fortress will unlock a shortcut to World 6-3: Fog Cemetery. However, completing World D-A will unlock a shortcut to World 6-6: Cawcaw Treeway.

Layout

Crystal Caves is a violet cave that has many underground enemies.

Levels

D-1: Swooper Cellar

D-2: Toxic Wigglershift

D-3: Spine Springs

Crystal caves

D-A: Carapace Catacomb Unlocked by the secret exit in toxic wigglershift and will exit out to world 6-6.

D-Fortress: Toxic Fortress

Other Buildings

Other Buildings in Crystal Caves: The red switch palace is in this world but before thins world is unlocked the world name reads ??? And this building is required to get the secret exit in 5-8. This is unlocked by the secret exit in world 5-5.

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