This is a correction for my previous upload about the DOOM2/WOLF3D 
levels.
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There IS a way to get to the WOLF3D level (no cheat) and this is it.

To get to the 1st WOLF3D level you have to take the special exit on
level 15.  If you look at your map on level 15 (after you get the
full map) you will see a figure that looks like a swirl on the bottom-
left hand corner.  And then attached to the swirl is another piece of map
that juts out; THAT is the secret exit, but it's not that easy.  At first
when you try to go there, the piece of map that juts out is just a wall,
so to make the wll dissapear this is what you have to do.  Remember the 
BIG lava pit that you had to jump across from that tower, well you have to
get on that piece of land in the middle of the pit.  The tower that you 
jumped from to get across the pit, you have to jump from that and land on 
the small platform (in the middle of the pit).  Look at your map, you 
should be able to figure out where to jump from to land on it.  Once you
land on it, pick up the radiation suit and the cell pack and hit the 
switch.  That opens a tunnel in the lava pit on the right side (reffering 
to the map), go to the tunnel and get the invincibility.  N O W, go to the
room at the bottom left of the map which requires the yellow key.  Go in
and walk STRAIGHT forward to the tunnel and go in and the wall will be 
gone.  Go to the left in the tunnel and get on the transporter.



To get to the second WOLF3D level this is what you have to do.

In the last room of the first WOLF3D level (with the elevator door in it)
, at the bottom-left hand corner (referring to map directions), there is 
a secret door; go in it.  Pick up the medikit but don't leave yet.  On the
left side of THAT room (map directions) there is another secret door, go
in it.  Pick up the supercharge; there is yet another secret door on the
left (facing the secret elevator door), that's where the S-charge is. Then
go to the second WOLF3D level!  :) 
 
By the way, if you don't know how to beat the second WOLF3D stage, you
have to kill all the commander keens, he he. :)
After you beat the second WOLF3D level, you go to level 16.
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If you have questions or comments, E-mail me. userID #76164,251