Trickery!  With the update to version 1.2 of Doom, there are now 
some changes to some of the levels in Episode 1.  If you had the 
maps (or had the level figured out...) for version 1.1 of Doom, you 
would find that you no longer got 100% Secrets or Items on some of 
the levels.  These maps are updates to the other Doom maps already 
out there showing the new areas of the levels that have changes. 
Created and edited by Tom Geery.