Information on Level 30 (Last Call) of TNT.WAD (Final DooM)...

Thanks to Robert J. Baker (robert.bak@bigfoot.com) for this information. He says:

Q. I've fought/warped/cheated my way to level 30 (Last Call) of TNT.WAD (Final DooM aka DooM95), and can't get across the lake. Whenever I jump to one of the blocks, there's a teleport flash and I end up dead in a dark place. This happens even in God Mode! What the hell (excuse the pun) is going on? Is it possible to get across?
A. (by ROBERT.BAK -- robert.bak@bigfoot.com) Of course it's possible, otherwise you couldn't progress!, but this is probably one of the most fiendish (excuse the pun again) traps ever set in any DooM WAD file! What the TNT crew have done is to set up a second Player 1 start in a dark sector isolated from the rest of the level, and most of those innocent- looking blocks are surrounded with linedefs that teleport you onto this second copy of yourself. Result: cross one of those lines and you telefrag yourself. As you may already have learned the hard way, God Mode does not protect against a telefrag, nor a spawnfrag.

The following ASCII map shows the path (also available as a cool 12K GIF image; you can get a copy from Robert's TNT page as well):


               ^
===============^============================================================
               ^
 %%%%% %%%%% +-^-+ %%%%% %%%%% %%%%% %%%%%
 %   % %   % |>^ | %   % %   % %   % %   %   % = DANGER! Cross this
 % G % % G % |^B | % G % % G % % G % % G %       linedef and you
 %   % %   % |^< | %   % %   % %   % %   %       telefrag yourself!
 %%%%% %%%%% +-^-+ %%%%% %%%%% %%%%% %%%%%
               ^
 +---+ +---+ +-^-+ %%%%% %%%%% %%%%% %%%%%
 |>>>>>>>>>>>>>^ | %   % %   % %   % %   %   - = It's safe to cross
 |^R | | B | | R | % R % % R % % B % % G %       this linedef.
 |^  | |   | |   | %   % %   % %   % %   %
 +^--+ +---+ %%%%% %%%%% %%%%% %%%%% %%%%%
  ^
 +^--+ %%%%% +---+ +---+ +---+ %%%%% %%%%%
 |^  | %   % |  V<<<<<<<<<<<<| %   % %   %   R
 |^G | % B % | BV| | G | | B^| % R % % R %   G = Torch colours
 |^  | %   % |  V| |   | |  ^| %   % %   %   B
 +^--+ %%%%% +--V+ +---+ +--^+ %%%%% %%%%%
  ^             V           ^
 +^--+ +---+ +--V+ %%%%% +--^+ +---+ %%%%%
 |^  | |   | |  V| %   % |  ^| |   | %   % 
 |^G | | B | | GV| % G % | G^| | G | % B % <>^V = Path
 |^<<<<<<<<<<<<<<| %   % |  ^<<<<<<| %   %
 +---+ +---+ +---+ %%%%% +---+ +--^+ %%%%%
                                  ^
       %%%%%       %%%%%       +--^+
       %   %       %   %       |  ^|
       % B %       % G %       | R^|
       %   %       %   %       |  ^|
       %%%%%       %%%%%       +--^+
                                  ^
   ===============================^====
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