I think this is really the point of these challenges. These challenges do not test our knowledge of programming games. They test how good we are at comming up with a game concept that we can fulfill in the given time, and how good we are to prune away features that are not needed.
It's too bad if you don't have anything to submit, but at least the experience should make you a better game designer in the sense that you know what you can or can't complete in a 30 day challenge.
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