In any game that uses the Doom engine, linedefs can be activated regardless of the player's Z position. This has the side effect of allowing the player to flip a switch despite being at too high or low of a height to reach it, or even if it is hidden in the floor. In certain maps, this can provide a shortcut of some degree depending on what the switch does. Instances of the bug in the original IWADs tend to be less dramatic, but include the following.