Rimworld
Minecraft
Fallout: New Vegas
Rimworld every time I touch this game, I lose weeks of my life. Yes, weeks not days. This game does something to my brain, and I'm not one hundred per cent sure it's healthy. I just opened up my Rimworld save and remembered why I rage quit. Man, I hate sieges.
I originally had The Sims 3 as my second choice, but if this doesn't include DLC/Expansions, then there's a lot more to do in Minecraft.
I'm one of those weirdos who actually likes Fallout 4, but I also love Fallout: New Vegas which has a lot more replayability and a more morally grey world where you can actually play the villain. Hell, by becoming Robert House's number one fan/minion I probably played an anti-villain role when I played that game. Although I enjoy Fallout 4, it had kid gloves on compared to Fallout: New Vegas.