Hints
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This text contain informations that might help you
while playing this game. Note that not all
hidden secrets (if you can call it that) in the game
are listed below. The one I listed below is the one I
considered helpful to get through certain level
or are the one I though interesting to know.
There are still many thing that are not listed here
for you to discover on your own.
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Actual Hints:
1.There are invisible stairs scattered across the levels.
  If you're stuck and have nowhere to go, try pressing
  up or down. Some of the picture inside the Gallery folder
  also show some invisible stairs in action.
2.in level 3 stage 08 right after the stair where you
  fight white skeleton and flying medusa heads there is
  a room to the left (see "Level 3 [4]" in the Gallery).
  There's some blocks that are placed like this:
  
  4
   3
       2
        1

  Jump to block 1 and then move to the right until you're
  on the very edge of it and then jump to block 2 and 3.
  You can then break block 4 which contain food that
  restore your health. You can also now reach the candles
  that contain almost all of the sub-weapons in the game.
  The candle on the very left contain a Fire Bomb/Holy
  Water, the candle to the right of it contain a
  Boomerang, the candle to the right of it (again)
  contain a Dagger, and then the candle on the
  very right contain an Axe.
3.Level 5 is a dungeon and a laboratorium. It's unknown
  why someone like Dracula need a laboratorium, maybe he
  want to experiment with human body?
  Whatever the purpose of the laboratorium was, every
  laboratorium of course have those thin glasses
  that look like stick. Try attacking them, some of
  them might give you a reward!
4.You might already figure this one yourself considering
  how easy to spot this one was. Heck, you might even found it
  by complete accident. In level 4 stage 12 attack one of
  the candles that merged with the block (you can see it in
  picture "Level 4 [1]" in the Gallery). The blocks will be
  destroyed and you can go down the platform below to get a
  Boomerang sub-weapon and a big heart.
5.Have you played Castlevania Symphony of The Night?
  Attack the same spot in Dracula's Chamber where you
  trigger the stair from the Prologue(Bloodlines).
  Make sure you have a sub-weapon beforehand.
  If you haven't played Symphony, play it right away,
  you won't regret it!