MAP18

A level called MAP18 appears in each of several different games and megawads:


 * MAP18: The Courtyard in Doom II
 * MAP18: Mill in TNT: Evilution
 * MAP18: Neurosphere in The Plutonia Experiment
 * MAP18: Spawned Fear in Doom 64
 * MAP18: Fortress: Stores in Strife
 * MAP18: Lake Poison in Alien Vendetta
 * MAP18: Internal Reaches 3 in Community Chest 2
 * MAP18: Hard Attack in Hell Revealed