One of the levels of Portal can be finished in mere seconds, by using shortcuts to skip the entire level. When playtesters figured this out, the developers decided to keep it, since only advanced players would know how to utilize it. In fact, in the advanced versions of that chamber, the qualifications for gold medals require that you do this. The commentary put it like this: If the exploit takes more skill and ingenuity to perform than doing it the intended way, it's perfectly reasonable to keep it in.
Submitted By: ZeoKnight
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