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. 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.


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


D-1: Swooper Cellar

D-2: Toxic Wigglershift

D-3: Spine Springs

Crystal caves

D-A: Carapace Catacomb

D-Tower: Toxic Fortress

Other Buildings

Other Buildings in Crystal Caves:

oxic Fortress

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