Category:Icon of Sin levels

This is a list of levels that contain a boss fight similar to the one found in Doom II's MAP30: Icon of Sin. While numerous PWADs include such an encounter, many deviate in some aspects from the original, such as altering the means by which the boss brain is killed, replacing or removing the image of the skeleton demon head as the implied entity the player battles, or disassociating the monster spawner from the boss brain by placing them in separate areas. To account for these variations, as long as a map includes an encounter present on all difficulties that involves at least one monster spawner launching spawn cubes and a boss brain that needs to be killed to end the level, it qualifies for this category, unless either the spawner or the boss brain have been modified to the point where they differ significantly from their original behavior.