After that, he jumped straight into Ultra-Nightmare. Speaking over Skype, DraQu tells me that he practiced for this run by first attempting the game on Nightmare mode. Only six hours later a different player, DraQu, who currently holds many speedrunning records for this latest Doom reboot, also completed this insane gauntlet. The first was Zero Master, who holds a speedrun record for Doom 2. Yet diligent players were able to best this test within two days of the game's release. One wrong move and a six-hour play session can be wiped clean in an instant. The premise is simple: Take the game's most punishing difficulty setting, Nightmare, then apply permadeath to it. Doom's Ultra-Nightmare mode is so difficult that nobody at developer id Software was able to complete it.