Grab your lab coat, or at least pretend you have one, and prepare to zoom way, way in because we're about to explore a world that's been hiding right under your nose this whole time. Ever wondered ...

The "nightclub level" — every game has one. From the rough and ready Grand Theft Auto series to the cartoonish Psyconaughts, to even the warfare of Call of Duty. It's difficult to avoid the classic ...