Can a former human (green-haired zombieman) defeat a healthy mancubus, when the player cannot directly interfere? No? What about killing an arch-vile with just a pistol and 50 bullets, no cover? It was rwdpa who started a thread which led to speculation about interesting TAS challenges: events which are impossible to do when normally playing Doom, but, when giving experts an infinite number of quicksaves and reloads, or just an opportunity to build each Doomguy's movement tic by tic, they can be accomplished and viewed. Aqfaq started the first challenge thread. Check out the Doom Speed Demos subforum for more. We encourage you to give us ideas, or even create maps. Make sure your task is really impossible with normal play, but theoretically possible.