Hex address for boss heart

What is the hex address for a boss where I can change the heart container into a blue rupee?

wizzrobemaster wrote:What is the hex address for a boss where I can change the heart container into a blue rupee?

This is a lot more complex than you think. You need to load the GFX also. This is not an "easy hex edit". I suggest you ask the speedrunning/randomizer community, since they are specialized in that. And as you can see, Karkat's randomizer was coded with a very extensive ASM to be able to pul this off what you want.

I would also suggest to you, to do something on your own, rather than to drop a question for each and every small edit you want to make.