Belmont's Revenge has a password menu you can access from the title screen. You have the chance to view a password whenever you run out of lives, select "password" at the continue screen to view it. Passwords can be made up from four things:
If you enter a password incorrectly three times in a row, you will be taken back to the game's main menu. Here's a complete list of all the stage passwords:
Start the game with Crystal castle completed.
Start the game with Crystal and Rock castles completed.
Start the game with Crystal, Rock and Plant castles completed.
Start at the first part of Dracula's castle.
Start at the second part of Dracula's castle.
Start at the third part of Dracula's castle.