MAP23

A level called MAP23 appears in each of several different games and megawads:


 * MAP23: Barrels o' Fun in Doom II
 * MAP23: Lunar Mining Project in TNT: Evilution
 * MAP23: Tombstone in The Plutonia Experiment
 * MAP23: Unholy Temple in Doom 64
 * MAP23: Order Commons in Strife
 * MAP23: Blood Sacrifice in Alien Vendetta
 * MAP23: Death Mountain in Community Chest 2
 * MAP23: Ascending to the Stars in Hell Revealed