A lot of people don't know this, but the original Castlevania actually had three different mobile versions, one of which was even released in the West. The first
one (from 2002) was a Japan-only release and is very primitive. However, this game got upgraded a year later. This
second version has better graphics and some of its sprites even seem to be based on the X68K version. This is the version that was also released overseas. Finally, the
third version, which is known as "Akumajou Dracula Complete Version", looks pretty distinct from the NES version and kind of has a remake feel to it.
I already played the original version many times, so I would be curious to try out either the second or the third mobile version. I was wondering if any of these mobile ports have been preserved? If they aren't, it might be a good thing to do so while it's still possible for preservation's sake.
Anyway, if anyone knows anything, please let me know.