I was going to say replaying but I feel like that limits the question to games like Prey or Fallout New Vegas that have endings and games like The Sims 2 or Cities Skylines where you can play indefinitely end up excluded.
I’m not really referring to games like League of Legends where you’re coming back every month. More so games where you stop playing for an extended period of time.
Super Mario world is a classic! I haven’t tried any romhacks for it, that sounds like fun!
Oh man Diablo 2. I’ve attempted to play it so many times, but I’ve yet to finish it yet. Not because I don’t want to, but it’s like every time I start up a fresh game, something happens to my game or save. I’ve lost a save twice now(this is over the course of 15 years) and the last time I tried to get it to run, it didn’t want to cooperate on my windows 10 install. It’s oddly cursed lol. I’ll finish it one day. I have to haha