Wallrunning

The wallrunning bug can occur when the player runs along a wall (either normally or by straferunning) while touching it. Occasionally, in this situation, the player suddenly finds himself accelerated to a rather greater speed than he can normally attain; this lasts until he stops running, or encounters a corner, or changes direction (e.g. by being hit by a monster).

In principle, this bug can be exploited as a speedrunning or deathmatch tactic, allowing the player to dodge projectile attacks or traverse long distances more quickly. It is rarely used in practice, however, because it requires that:


 * the level contain a long, straight wall in the appropriate place(s);
 * the player rapidly orient himself precisely perpendicular to the wall; and
 * the player then wait a moment for the acceleration to begin.

Demo files
[[Media:d213wrb.lmp|The wallrunning bug]] on MAP13: Downtown