Castlevania: Curse of Darkness

Enter a warp room after beating the game.

After beating the game once, if you start a new game and put @CRAZY as your name, you will start the game at a higher difficulty setting.

Have a Lament of Innocence save file on your Memory Card.

Once you beat Crazy Mode, the Moebius Brooch will be available in the shop. Equipping this item allows you to do special moves without using hearts.

After beating Boss Rush Mode, the music box should appear in the warp room. With this item, you should be able to access the Sound Mode Option to play various music from the game.

After beating the game once, if you start a new game and put @TREVOR as your name, you'll start the game as Trevor Belmont.

Simply sit in the 23 other chairs in the game. Don't forget about Dracula's Throne during the final fight with him; it's your only chance to sit in it.