I second this. It's harder than Adventure. I'm currently playing on the third loop.
Adventure Rebirth on hard with classic mode and one life is probably the hardest challenge I've attempted so far. I've yet to make it past stage 3.
I still haven't played
ReBirth (or
Judgement) because I don't have a Wii. Must be a pretty good game if you're using it as a challenge like that, hope I can get it before Nintendo pulls down their service.
X68000 and Legends are way more difficult than CV1 and Bloodlines.
I'd even say that Bloodlines is the easiest ClassicVania game.
Dunno, the sheer fact that you don't have infinite continues makes
Bloodlines more frustrating if not actually more difficult to me. I'd say SCV4 is way easier in any case. I found
Legends to be pretty easy to. But
X68000 is one difficult mamma jamma no doubt about that.