there's a lot of ways to do the glitches....that page is loaded with them.....the most famous (as it was the first discovered) was the sword brothers glitch near the chapel....but another popular one is the heart-fresh glitch......it's pretty simple really......you need the duplicator to do it, and at least 2 heart refreshes.....equip the duplicator and a heart refresh in each hand....go to an edge of a room (like when you walk through and the screen changes to another room)....well, what you do is get near the entrance to the next room, but don't go in....jump like you're going to go into the next room, but as soon as you jump hit a heart refresh, then the other one (like SQAURE, THEN CIRCLE) and keep going back and forth.....if you jumped right, and if you keep using the heart refreshes enough times, you'll fall through the floor, giving you access to parts of the castle you normally can't go.......if you go to where the NIGHTMARE is (remember that spot? where it looks like a save point, but was actually a protal to the nightmare where you fight that crow-witch-bitch who pretends to be your mother)....anywho, if you do the heart refresh glitch there, and when you're in the floor, stop heart refreshing and you'll be beneath that room, move alucard to the other side.....if done right, you'll end up in an RIGHT-SIDE-UP-CASTLE glitch version of The Outer-Wall, located in the UPSIDE-DOWN-CASTLE near the caves.......pretty nifty.....have fun, good luck, and have lots of patience.......

but just out of curiousity, how much of SYMPHONY of NIGHT expert are you?