MAP02: The Catacombs (The Abyss)

MAP02: The Catacombs is the second level of The Abyss. It was designed by H2SO4. This level teaches basic concepts of the non-linear, "spelunking" style that will be the majority of later levels, but in a simpler, more linear context.

Essentials
The first two doors are marked with a red, spray-painted "X".

Trivia

 * The Red key grotto is listed as a secret area, even though unsealing the entrance is required to open the Baron door.