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A Beam in the Dark, otherwise named World 
Bowser-6, is the sixth level in World Bowser from Super Mario 3D World, becoming accessible after the completion of either Footlight Lane or Deepwater Dungeon. Completion of this level unlocks Grumblump Inferno.
Layout
This level takes place in a dark Ghost House inhabited by Boos, Peepas and Parabones.
Green Stars
- Green Star 1: The player can look into a large mirror to see the green star's reflection.
- Green Star 2: After the checkpoint, there is a Mystery Box. In the box, the player must defeat all 6 Boos with light to reveal the green star.
- Green Star 3: At the end of the last hallway, the green star is guarded by a Big Boo.
Stamp
- There's a Character Switch that only Luigi can activate that will reveal the Stamp. (See picture)