The demon from "DOOM" if you don't know "DOOM" well doom is an fps made in the 1980's the thing is the computers are not that advanced that day but doom is able to run on those devices because it's not 3d the reason is that it's a 2d illusion that made it look 3d if you think that "oh there's no multiplayer" there is idk how but it's incredibly impressive to see that run on old computers they did so much on optimization on the data it can run on a calculator, potatoes well that's all I know😐