Beat the game. Start a new game with the name @CRAZY to unlock Crazy difficulty.
Play as Trevor:
Beat the game. Start a new game with the name @TREVOR to play as Trevor.
Beat the game on Crazy difficulty to unlock the Moebius Brooch for purchase at the shop. It lets you do special moves without any heart cost.
Have a saved game file from Castlevania: Lament Of Innocence on your memory card to get an Moai statue worth 5,000 gold.
Beat Boss Rush mode to unlock the music box in the warp room. Use it to hear the game's music.
Thanks to Revolution readers bloodboots and PSTONE!