A dummy level is an intentionally unsolvable final level in a custom level set to prevent the Termination Glitch. Levelsets ending in with 144 or 149 will end with the normal ending sequence, but if they end on any other, the glitch ends the session as Chip's Challenge was always designed to end at these two levels. To avoid this, a dummy level prevents the player from completing the last level. The term is believed to have been invented by Drew Thomas, who ended his levelset with this small, unsolvable level: The name of this, simply Dummy, stuck ever since.