I remember doing this with the built-in tool of some emulator. They would let you filter by exact match and you could filter it down again after changing the va

I remember doing this with the built-in tool of some emulator. They would let you filter by exact match and you could filter it down again after changing the value (losing a life). But for stuff where exact matching wasn't practical like say a more or less continous health-bar, you could instead filter by searching for values that decreased / increased / didn't change. Of course you would also have to guess at the data type but there weren't that many likely choices.