How in the world did they come up with the obfuscated code for this? Surely they must be using a tool?
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I remember one back in the day which wasn't obfuscated at all. It was clearly a simple utility. Except that it didn't do what you thought it did, it did something completely different. (alas I can't remember the details...)
Perhaps it was the Underhanded C Contest[1][2]? It's another competition, entires there often seem simple and perform something unexpected.