[quote name='Jedi1979']From a Doom Shareware secrets Help file found at
http://www.gamers.org/dhs/chtssplr/dmshrwr.html
1-1 At the end of the room of ooze, check the discolored wall on the
right. This leads to a blue armor suit.
1-2 When you cross the barrel in the room before the exit room, the
ledge that the pesky imps were shooting you from in the ooze room
lowers. Go back and check it out.
1-3: After lowering the pesky imp ledge (1-2), if you go back
through the curved hallway into the "blue" room, a floor
board in the hallway lowers a small elevator in the chamber
where the pesky imps were. If you run quickly from the blue
room, across the ooze and into the imps' chamber you should
see the elevator on the left side. There is just enough time
to hop onto it before it rises.[/quote]
I did all that and collect all items I can find but still end up only getting 97%.