Catwalk

Catwalks are a type of obstacle or trap in Doom in which the player must navigate over a very tall and narrow bridge, with long pitfall drops on either side, usually filled with a damaging liquid. A catwalk can be used to make it difficult for a player to reach an item or area, as it requires the player to make very precise movements.

Many examples of this type of obstacle appear in Doom II's MAP24. Christen Klie created a level in The Master Levels for Doom II titled "The Catwalk" where a catwalk must be quickly ran across before it crumbles to the floor to reach the exit.