Suspended in Dusk

A set of four levels, which all push the limits of the good ol' vanilla Doom.

If your computer refuses to cooperate with doom2.exe, I recommend Chocolate Doom: http://chocolate-doom.sourceforge.net/

Has also been tested and found functional on ZDoom. Other ports may or may not break some effects. I really don't recommend playing this on a 3D-accelerated port.