Technically these aren't mods or hacks, but I thought they belonged here anyway, as they are different in many ways from the original game. There are many listings online with articles about the many different unreleased prototypes, some even with completely different content, like extra stages. Included in this archive are two such prototypes. One is the Just recently dumped Bloodlines v0.1 Prototype which contains many many differences from the original game like different sound effects, music, enemy sprites, sub boss types etc. The other is the Europe version's New Generation Beta v0.3, which also has some minor differences and a completely different palette. In both of these versions, Entering the Konami code at the Main Selection Screen, (with start game, password, and options) will enable a level select in the top left corner. A button goes up one level, B button goes up 10 levels, C Button goes down 1 level. There are a couple mentions of people possibly dumping the 0.5 Beta which contains different stages as well, but sadly I could not locate them in the end. Even the links at the CV Dungeon Forums that mention it are dead. So for now, here they are. Note: I do not own these, nor did I mod them.
I remember this one, I played one where there's a music bug, the music start from the beginning once you go through a door/change rooms.
Yeah this is the same one. But I figure if I put them up here, more skilled hackers may be able to take sprites, and background tiles of each, and put the unused features into the Pyron Enhanced color hack. Making it sort of like the Monster Party Prototype Restored hack. Fans of this game need a hack like that.