Dunno, Alex, all the Dx levels utilized a theme, there really aren't more than 1-2 sets of doors per level, and a pretty uniform texture set throughout...especially D2. You're going to have to run through them all.
edit: oh yea, forgot about user levels...isn't there a GetMad v230957?
There are four boxes to use in the defense of liberty: soap, ballot, jury, ammo. Use in that order.