What's the least demanding PC game ever? any genre, not emulated(non-FPS/CPU intense)

I saw a thread asking what the most FPS demanding game of all time is currently, and I'd like to know the opposite; WHAT IN TARNATION is the easiest official PC game to run? Meaning the least demanding in terms of all hardware parts (leastgpu,cpu,ram usage)? I'm hoping to get some answers I don't expect. There's some obvious contenders but I haven't seen benchmarks for this so my curiosity is peaked for the truth.

I would like to say Overwatch maybe? Witcher 3 is rather demanding but I'm not really sure. A lot of companies tend to optimise these types of things so users don't have to have a beefy computer to play their games.

If you want a game that people actually play, maybe quake 2/3 or CS 1.6 / CS:S / CS:GO.

i would say osu. just disable snaking sliders lul. my 5 year old laptop still gets 140fps

mount and blade warband, my potato laptop from 10 years ago can still run it lol

Any game type? That's hard to answer... I'd go with Papers, please by Lucas Pope.