Note that the music will remain silenced until you either die or enter a new area.

Toggle sound: Press C to toggle both music and sound effects on or off.

Life refill + 99 gems: Press B to instantly max your character's life bar and gem count.

The last defined entrance seems to be invalid, as you emerge from the bottom of the screen partway through stage 2-5 and fall to your death immediately warping to the next entrance from here will return you to the beginning of stage 1-1.

Stage skip: Hold Up or Down and press A to warp to the next or previous stage entrance, respectively (same order as the table above).

Is there some button combo that enables invincibility?

Interestingly, this cheat was mentioned in the Castlevania Bloodlines strategy guide on the Sega Channel January 1996 dev disc. All values above 29 will crash the game at a black screen. Upon starting the game, you will be warped to the selected stage entrance. After entering the code, a number will appear press A to increase the value by one, B to increase it by 10, or C to decrease it by one.

In this build, entering the Konami Code ( Up, Up, Down, Down, Left, Right, Left, Right, B, A) at the main menu unlocks a stage select (technically, stage entrance) instead of Expert mode.

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