Here is a riddle for you. When is Doom not Doom? Why, when its open-source code has gone through countless iterations and become a modern development platform in its own right!

Sometimes a Doom mod outgrows its old home and breaks away as a completely standalone game. This week I'm bringing you an all-you-can-eat buffet of free, full games (and some demos) that are the best to have flown Doom's nest. The list includes platformers, horror, racing, deathmatch and plenty of old-school FPS fun. Some of them have even settled down to raise their own mod scenes and their own spin-off games. Isn't that sweet?

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