If I could play three games for the rest of my life, the first would be Minecraft and I could manage fine foreiting my other picks. It's a rare singleplayer "forever" game that's stood the test of time remarkably well. It's most likely the greatest game ever made, defining the medium as a whole culturally instantly since release - blowing the sandbox genre wide open, pioneering the lets play/content creator concept, the evergreen free update model, independent games biggest success story: it's done it all. Say what you will. It's fucking Minecraft.