Castlevania (Nintendo 64)

Unused Status Effect
STO (probably short for "Stone") has no effect other than making your character bend over. It was likely cut because there is only one single area where you can be petrified, and having a separate status effect just for that didn't make sense. To apply it to your character, use the code.

Unused Items
Incandescent Gaze - Description reads Highlights player's focus for a fixed period. This could highlight a fixated target for a certain amount of time, even after the player disengages its target.

Pot-Pourri - Description reads ''Cures fossilization. Aroma softens fossilized body.'' Likely used to revert from stone quicker.

Engagement Ring - No description in the English version, but one in the Japanese version (A present from the Dark Lord. By only holding it). Holding it in the Japanese version raises Carrie's status by 10%.

Regional Differences
The Japanese version saves to the cartridge, while the international versions save to the Controller Pak.