"Things that shouldn't be running Doom are running Doom" is a category that has been around for years. Pianos, printers, restaurant order screens, motherboard BIOS, intestinal bacteria, Doom itself: the list goes on and on. Doom itself: The list goes on and on.

The video Clayton released on Twitter (via Kotaku) was nothing out of the ordinary. Strange angles, low-resolution textures, and a decidedly flat Space Marine waiting for someone to lead him into battle against the minions of Hell. But after a few seconds, he jumps out of a nearby window (you can never jump in Doom, it's just a matter of time before you get there), and the whole thing is over.

This is not Doom at all! It really isn't: Clayton told Kotaku that the UEFN programming language was "too high level" to actually run "Doom" in "Fortnite," so he had to use a fake instead: he used the Ultimate Doom Builder to create an E1M1 He exported it as a 3D model and imported it into Fortnite's editor. He then said that the bulk of his labor went into making it look "unlit and unfiltered" and giving it the "awkward rotation effect" familiar to space marines

"Having released a number of Doom-inspired games on Steam in the past before moving to UEFN, having the experience to replicate its visuals and gameplay style helped a lot," Clayton told the site.

Clayton said he took on the Doom-in-Fortnite project even though he knew he couldn't publish it, both so he could learn more about UEFN and as a way to "trick" his friends. They convinced him to put the video up on Twitter, and history proved the rest.