In video games, clipping problems, also called collision detection problems, occur when an object passes through a barrier (such as a wall, floor, or ceiling) that it was not intended to pass through. This is a very common bug found throughout many video games. This can happen, for example, in Doom 2 when a crushed monster is resurrected by an arch-vile. Clipping problems can often be used as a time-saving tactic in speedruns, for example, in Super Mario 64 it is possible to skip walking up the spiral staircase in the castle by jumping through the ceiling.