I won't number it cause I can't decide on what I like more over the other. I like them all for different reasons, I'm also going to use just one game per franchise:
After 17 years I'm still booting up Fallout 2 and enjoying it just as much as I would back in the day. It is a game that is truly timeless for me. Sure some thing could have been improved as it is not without its flaws but it is simply the best roleplaying experience I've 'ever' had.
Take the psychadelic haze of mass murder with an 80's art scheme and inspired music and then add a great minimalistic storyline and you get Hotline Miami 2. The level editor they got a beta out for means you'll be able to squeeze even more enjoyment out of the game.
What can I say about it? It's old, it's ugly, but god damn if it isn't charming. Open levels that allow for a lot of different approaches, different augmentations that can dramatically alter how you play the game. RPG elements up the ass. Great storyline, great characters, great writing. I love it.
- The Walking Dead [Season 1]
It's more of an interactive tv-show than a game to be honest. But whatever, the story, characters, twists and turns are all amazing and the ending forced my eyes to act all strange, some sort of salty liquid that slid down my cheek...
Only thing close to a spiritual successor of Fallout.
An amazing SNES jRPG about time-travel.
Good turn-based combat. Choice and consequence. Post-apocalyptic setting. Three things I really enjoy wrapped up in a neat package.
Guilty pleasure, I dunno what it is about The Sims but I just enjoyed vicariously living through pixels.
A point and click adventure game set in a zombie setting. Lots of humor and references. I love it.
Good side-viewed stealth game, pretty much the only stealth-focused game I've enjoyed to this kind of extent.