"After seeing clones of Doom arriving on calculators a few years ago, the real game is finally arriving on them, specifically the TI-Nspire and TI-Nspire CAS models," the video's description reads. "It's still in beta, though: As for now, the game runs for 20-60 seconds then freezes randomly. Some animated GIF captures can be found on the site. They look much clearer than in the video, but the framerate is much slower."
Doom was first released in 1993 by id Software. The series is widely considered to be a pioneer for the FPS genre. It introduced features such as 3D graphics, true 3D spatiality, networked multiplayer gameplay, and support for player-created expansions.