you have to beat each stage on each difficulty in order to unlock secret stages
you have to beat the previous difficulty before the next one will count (just as you have to beat each stage on Normal at least once to get to the next one) --- I may not agree with what you have to say, but I will fight to the death for my right to fight you to the death. -Stephen Colbert
are you suri found some certificates of entrance (or something like that) and i got in with those there is also a quest from hoffman that allows you to get the certificate there are two modes normal and hell hell is unlocked when you find another certificate while doing normal --- War is our sculptor. And we are prisoner to its design. Life doesn't stop being funny just because the dead can't laugh.