To get the unlock stone to open the door in the prison of eternal torture (the place next to the portal thingies) go to the second floor of the pagoda of the misty moon and go to the door opposite the one you see when you first come up the stairs (when you turn your map to face the direction that things are really facing, the door on your right). you will eventually wind up in another dark room. double jump straight forward and you will land on a platform, run and then double jump to you left and you will again land on a platform, run to your left again and double jump again to land on another platform, this time double jump forward, and then double jump to your right and your be in front of the door.
When you fighting phantoms look at the floor to see what they really look like, and when your fighting the mirage skeletons, the real mirage skeleton is the only skeleton the casts a reflection on the floor
Unlock Music Test
Finish the game using any character and save. Go to Rinaldo's shop and buy the music box.
Unlock Boss Rush Mode
Finish the game using any character and save. Look for the Boss Rush option on the level select screen.
In Soul Mysteries Lab: Red Phoenix Lock, Yellow Dragon Key
In Garden Forgotten By Time: Blue Dragon Lock, Red Phoenix Key
In The House Of Scared Remains: Yellow Dragon Lock, White Tiger Key
In The Dark Palace Of Waterfalls: Black Turtle Lock, Blue Dragon Key
In Ghostly Theater: White Tiger Lock, Black Turtle Key
Unlimited hearts or money
If you want unlimited hearts or cash, just smash the little purple stands. When all are smashed, just leave the room and walk back in, and they'll e reset.
Vicious 10 Hit Combo
First of all, you MUST have three abilities to do this combo. These are Vertical High, Rising Shot and the five hit midair combo. If you have all three, the combo is square, square, square, triangle, square, square, square, square, square, square. If you have the Vampire Killer whip, this combo will cause well over 200 damage, except on very well armored enemies!