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Crystal Caves is the fourth world in New Super Mario World. It is cave/underground themed. The Switch Palace is purple. The boss is Morton Jr.
- 4-1: Crystal Cavern
- 4-Ghost: Underground Mansion
- 4-2: Volcanic Tunnel
- 4-A: Underground Lake
- 4-3: Construction Cave
- 4-4: Minecart Ride
- 4-Castle: Morton's Wrecking Ball Castle