Sweet. I know you’ve probably been getting by on that shareware version of Doom for the last 15 years or so, but don’t you think it’s time you went legit? Well, you’re never going to get a better price than on this weekend, as all id games are 50% off their already pretty low prices on Steam . Commander Keen? $2.50. Hexen? $5. Doom III? $10. And since I play them regularly, I can tell you that they’re just as good as you remember, especially Quake.