I once found the unreal tournament goty edition in a self-contained 300MB-ish exe file.
It would take forever to start due to the on the fly unpacking but ran almost on anything cause the game was so old by then that we snuck a couple of games once at an old job in the regular corporate laptops with integrated graphics just to see if it would work and it did🤘🏼
Imma see if I can find it again 🤞🏼