Probably Cities: Skylines, since it has quite a bit of depth to it, as well as a creative element, which helps me not get bored with it. Another strong contender is Minecraft, although it trades depth for a stronger creative element. I can't imagine taking with me a game that could end, realistically speaking, and games where all the content is created by someone else can end. Skyrim? Yeah, great fun for a long while, but once you've explored it all, there isn't much more to see.







