If there’s internet, which I’m assuming there is.
PC: Minecraft - for the arguments already stated here.
Rainbow Six Siege - I’ve put tons of time into this game and I honestly just keep coming back to it. It’s a blast from a competitive standpoint, and if I could theoretically still play with my friends on it, I’d love it.
Crusader Kings II - I’ve put almost 100 hours into this game and I’ve barely scratched the surface. Big fan of how every run can play out ridiculously differently depending on who you pick, and where you’re located, and of the mechanics in general. Plus, quality DLC still keeps getting released for it.