Wallrunning

The wallrunning bug can occur when the player runs along a north-south wall (either normally or by straferunning) while touching it. Occasionally, the player will be accelerated to a greater speed than is normally attainable; this lasts until the player stops running, encounters a corner, or changes direction (e.g. by being hit by a monster).

An agile player can exploit this bug as a speedrunning or deathmatch tactic, taking advantage of north-south walls to dodge projectile attacks or move quickly between distant areas of a map. Its use in deathmatch play is somewhat limited, however, because it requires that:

• The level contain a straight north-south wall in the appropriate place(s);
• The player figure out which way is north, possibly during a fast-moving firefight;
• The player rapidly orient themself at the desired angle to the wall (either precisely along it, 38.7 degrees away, or 45 degrees away); and
• The player wait a short time for the acceleration to begin.

Demo files

• The wallrunning bug (File:D213wrb.lmp) on MAP13: Downtown