[cc;ed to e-mail address]

Frank writes

The yellow key is missing from the original release
of that Episode.
There are a few things you can do about it:
Get a patch to fix the map;
Use cheat codes to get the key or get through
parts of the map;
Skip patches and cheat codes and use a trick to
get to the exit.

Here are some details on the patch:
http://classicdoom.com/pctnt31p.htm

Cheat codes:
http://classicdoom.com/doomcode.htm

A demo showing how to exit without using a patch
or  cheat codes:
http://classicdoom.com/tntdemos.htm#31b
(look for TNT31EX.LMP)

How to use demos with Doom95:
http://classicdoom.com/how-lmps.htm

Hope this helps, :-)

--Led

Support for console and PC Doom games
http://www.ClassicDOOM.com