MAP31

A level called MAP31 appears in each of several different games and megawads:


 * MAP31: Wolfenstein in Doom II
 * MAP31: Pharaoh in TNT: Evilution
 * MAP31: Cyberden in The Plutonia Experiment
 * MAP31: In The Void in Doom 64
 * MAP31: Training Facility in Strife
 * MAP31: Killer Colours in Alien Vendetta
 * MAP31: Idée Fixe in Community Chest 2
 * MAP31: The Descent in Hell Revealed
 * MAP31: Secret in Scythe 2