Vampire Killer, the first stage theme from the original Castlevania, is one of the most enduring pieces of video game music in its entire history. I do always admired that Konami was well aware of how much the community loved its soundtracks, and each successive sequel has usually had some kind of remixed versions of older songs. It sorta started around Castlevania III, which reused Vampire Killer titled as "Deja Vu" in the castle halls, while Super Castlevania IV started the tradition of the Holy Trinity of Castlevania Music - Vampire Killer, Bloody Tears, and Beginning - from the first three games, respectively.
So, I went through all of the versions of Vampire Killer and spliced segments from each into a full length song. It loops around three times before fading and I think has about 25 different pieces of music. I didn't include every single remix, but most of them are accounted for. I think it sounds pretty good, except the version from Circle of the Moon REALLY sounds out of place. I probably should've used another segment, but I didn't feel like going back and re-editing it. If nothing else, it shows how odd that version sounds compared to the rest. It's (very) loosely in chronological order, which gets wonkier as it goes on and on.