Comments - act17

The monster sprites, and well all sprites for that matter was taken from Doomkid's XMas Doom collection, which you can find at Moddb.com.

1. I believe that you're referring to the ceiling/door in the Apartment-Complex-Building-Stucco thing on the Southwest corner of the map. The reason why you can't open that is likely due to the really funky lighting I did with the sectors; where there's a sector that just barely grazes the linedef for the ceiling/door. This probably interferes with opening the door, but I'm not really going to change that.
2. The bridge is supposed to be raised when you hit the switch in the BFG room. That's what the switch does; it skips having to go in the Grey-Brick-Switch building to slowly raise the bridge; rather, the switch in the BFG-room raises it at a faster rate, so you can kill the Cyberdemon and open the secret exit.