I'm still amused to see that some people consider this game exceptionally hard. I love it! (It might be hard if you try to kill everything....I wouldn't know. All I know is, really fun game!)
Look, I'm not saying history can't change, I'm just saying that the first person to use the term "Diablo" was referring to the capital city erected by Satan upon falling to the underworld.
OK, I found the secret level...
And actually, Diablo is the mythical "capital city of hell" invented in Milton's "Paradise Lost". Geez, learn your literature.
I still can't find it, tried the hardest places I know, including every single area and dungeon, as well as teh credits screen and every shop....I'm confused.