Piranhas in the Dark
From the Super Mario Wiki
Piranhas in the Dark, or Layer-Cake Desert-3, is the third course of Layer-Cake Desert in New Super Luigi U. It is unlocked by completing Spike's Tumbling Desert, and its own completion unlocks Wind-Up Tower.
The level starts in a desert setting with a Warp Pipe that will take the player to the underground portion of the level. There is a hidden Super Star above the warp pipe. The next portion of the level is very dim, with spotlights lighting the way throughout the course. It mainly consists of tilting platforms that move up and down.
If the Piranha Plant guarding the third Star Coin is defeated, an 8-bit Luigi can be seen.
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