GOTCHA! Hahahahah...
There is no secret world in Super Bomberman 3. It was just a throwaway joke, but when people started taking it seriously, I figured "why not?"
So here's the joke level that I made and recorded:
http://www.megaupload.com/?d=DLLQZW34
It's derived from the Bomberman engine that I worked on in Game Maker, so it only runs on Windows. Also, it's highly unpolished - mainly the enemy AI isn't that great because I didn't spend a whole lot of time on it, thrown/punched/kicked bombs don't interact all that beautifully with the enemies, and I didn't rip all of the necessary sprites for Bomberman. I figured that, while recording, I'd do things just right so that the flaws wouldn't be exposed so easily.
Thanks to Duke Serkol for getting in on the joke toward the end here.
Sorry for any disappointment! I just couldn't resist an opportunity like this.
(By the way, in case you didn't notice, the hooded enemies' sprites are based on the Pygmy sprites, and the demon enemies' sprites are loosely based on Fish Men. I made all of the tiles for the stage.)