Monsters stuck in doortracks, walls or hanging off lifts

Any monster in Doom can be stuck on a ledge. They must be forced to a ledge by being attacked, or they can move themselves to a ledge and become stuck. When they are stuck, they will try to move, but stay in one place. They cannot attack when stuck on a ledge, but some monsters can attack the player if close to them. This only applies to monsters with a melee attack (such as the Imp). Stuck monsters can be pushed off and freed if a player or monster pushes it toward the pit by attacking it.

Boom includes a fix for this bug.

Demo

• Demonstration of the bug on MAP01: Entryway (file info).