Rimworld with mods. The shear amount of wild and bizarre experiences that I have in that game could easily keep me entertained for a lifetime. I doubt I’d get bored with it. Other than Stardew Valley and Zelda BOTW, it’s the only game I keep coming back to and unlike those two games, I don’t get bored of it. I simply have to tear myself away from it so I can function like a normal human being again.