I was looking up random stuff on Youtube and happened to come cross a video showcasing the game Doom on a Ti-Nspire calculator. Surprisingly, I happen to have a Ti-Nspire to mess around with.
Ndless is an extension that allows the Ti-Nspire to run assembly programs such as python, Doom, and even Minecraft (they are ports, not the real thing). Without getting into too much of the detail, you basically download a file, send it to your calculator, open it, and you’re done. The entire tutorial is on their website if you’re interested.