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Successfully complete the game to unlock the Boss Rush option. There are three levels (easy, normal, and hard) that must be unlocked by playing each in succession, starting with easy.

Unlock Boss Rush mode, then press Up(2), Down(2), Left, Right, Left, Right, B, A, Select at the Konami logo. Select Boss Rush mode to play as the NES version of Simon.

Get the Monster Tome relic during game play to unlock the "Encyclopedia" option at the "Secret Info" menu, which details all monsters that you have defeated.

Get all of the Dracula relics and go to Castle B. Equip both the JB and MK Bracelets. Go down into the room and you will start fighting Maxim after talking to him. Defeat Maxim and all the Dracula relics will start flying around and Dracula Wraith will appear. When the battle starts, enter the pause menu and go to "Relics". You will see that you still have all of the Dracula relics, even though they flew away and made Dracula.

When you combine the Bolt Spellbook with the Bible secondary weapon, your character will have a double orb shield in front of him. This shield is one of the shields from Konami's classic Gradius series, with similar sound effects when it collides with enemies.