The undead glitch is one that is found when a downwards launchpad on the map. The Ninja runs into the pad, gets stuck, and continually presses upwards as something kills him. He is then "dead" and cannot interact with any drones,gold, mines, switches or turrets, yet can walk freely around the map with only the restraints of tiles and locked doors. An example of this is Indecision, a map I have made myself to show all the different possibilities of the glitch.