Moai Statue:
On your Memory Card have a Lament of Innocence save file

Trevor Belmont Mode:
When you have beaten the game once start a new game and enter @TREVOR as your name and you will start the game as Trevor Belmont

Crazy Mode:
When you have beaten the game once start a new game and enter @CRAZY as your name and you will start the game at a higher difficulty setting.

Moebius Brooch:
When you have beaten Crazy mode the Moebius brooch becomes available in the shop. When you have this item you will be able to do special moves without using hearts.

Boss Rush Mode:
After beating the game enter a warp room

Sound Mode:
When you have beaten Rush mode the music box will appear in the Warp room. When you have this item you will be able to access the Sound mode option and play music from the game.