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.
Classic Simon
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.
Encyclopedia mode
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.
Glitch: Keep relics
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.
Gradius reference
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.
Gradius reference
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.
Hard mode
Enter HARDGAME as a name after completing the game at least once. A voice can be heard at the start of the introduction to confirm correct code entry.
Keep relics
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.
Maxim Spells
The same spell that will call duplicate Maxims to fight enemies will summon a healing when all alone. Just face right, & in one continuous motion, push LEFT,DOWN, RIGHT, DOWN, LEFT + B. Thanks to NeT1Bler for the summoning directions. This spell will enable you, as Maxim, to travel further and not to have to worry so much about getting to a Save Point.
No magic
Enter NO MAGIC as a name after completing the game at least once.
Play as Maxim Kischine
Enter MAXIM as a name after completing the game at least once. He is faster and jumps higher than Belmont.
Play as Simon in Boss Rush Mode
First, finish the game with any ending to get the boss rush mode (as a new option at the title menu). After getting the boss rush mode, play through it at least once. Then, from now on, when turning on the game or when resetting it, wait for Konami's logo screen to appear, and press UP, UP, DOWN, DOWN, LEFT, RIGHT, LEFT, RIGHT, B, A. Now the character for the boss rush mode will be changed to Simon (8-bit version) until you reset or turn off the game.
Rare ghost
The Rare Ghost can only be seen in specific parts of the castle. The easiest is in the room below the Clock Tower B warp point. Keep entering and exiting the room until you see it. It will appear twice every twenty times at the very least. Once it sees you, it will run.
Secret room
Go to the Sky walkway area of the castle and make your way to the save room, which is near the enterance to the Clock Tower. Equip your crushing stone and power up your charge attack. When powered up, jump add blast the block of bricks on the opposite end of the room. You have now opened a hidden room. In castle B, the room contains 2 medicine jars. In castle A, it'll contain the Heart of Vlad.
Sound test mode
Successfully complete the game with the good ending (where you rescue Maxim and Lydie).
Summoning Tome
Go to Castle B's Skeleton Cave. First, have the Griffin's Wing and go into the double exit save room near the entrance area with the big pillar. While in the save room, save the game then use the Griffin's Wing and go through the roof. You will get Wizard's Urn and Summoning Tome.