This is the first of my 3 WADs (Yes, I created only 3 maps in my life, between December 1995 and May 1996) - and it is more a puzzle than a standard DooMing map... Very little monsters, even lesser quantity of ammo, and very nasty trick with the lava cave... And it is single-player only.
Tired trying to solve it?.. Read a spoiler:
<spoiler>
1. Yes, the red key is at the end of that cave - such a sadist I am.
2. If you will step into any lava pool or run over erupting gas flame, you will die INSTANTLY - regardless of your health and armor. Guess, how I implemented that trick? (this is not jDoom trick, it worked in the old DooM as well)
3. If you will be lucky enough to avoid all dedly pools, and will run fast as hell - then running for the key will take as minimum 120% of your health - so, look for supercharge ;)
</spoiler>
So... More to say, this map is adapted for jDoom and will NOT work properly in the originald DooM.