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. A dominant example of this type of obstacle appear on many parts of Doom 2 MAP24: The Chasm. Chris Klie created a level in The Master Levels for Doom 2 titled "The Catwalk" where a catwalk must be quickly ran across before it crumbles to the floor to reach the exit.