In addition to the other games people have mentioned, I'd add FTL. I usually don't like roguelikes or space-combat games, but FTL is utterly absorbing and has n

In addition to the other games people have mentioned, I'd add FTL. I usually don't like roguelikes or space-combat games, but FTL is utterly absorbing and has near-infinite replay value for me. The game is only about 0.5-2hrs for a playthrough, depending on how well you do, but I managed to spend most of my weekend playing it anyway. My opinion is that there are more great games nowadays, but they're harder to find because there's also a lot more crap, and different people disagree on what is and isn't crap. The best games are not necessarily being produced by the big studios. So you have to go to the effort of finding the studios you like, and finding people with similar tastes so you can trust their recommendations.