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
D-A: Carapace Catacomb
D-Tower: Toxic Fortress
Other Buildings in Crystal Caves:
- Challenge House H can be accessed after completing D-1.
- The Crystal Music House can be accessed after completing D-A.
|Newer Super Mario Bros. Wii worlds|
|W1 Yoshi's Island • WA Goldwood Forest • W2a Rubble Ruins • W2b Soggy Sewers • WB Mini-Mega Island • W3 Mushroom Peaks • W4 Sakura Village • WC Sky City • W5a Freezeflame Glacier • W5b Freezeflame Volcano • WD Crystal Caves • W6 Pumpkin Boneyard • WE Bombard Cliffs • W7a Sky Mountain • W7b Starry Skies • W8a Koopa Planet • W8b Koopa Core • W9 Bonus Land|