Cheat Engine

[ParkourPenguin]

If you replace an instruction with NOPs and it affects mechanics other than the one(s) you were concerned with, then that means the instruction accesses multiple addresses. Right click on it in the disassembler and select "Find out what addresses this instruction accesses" to confirm that. There's a topic covering different strategies of solving this kind of problem here.

Also, don't worry about that instruction's bytes. There are two main ways to view an instruction- the mnemonic and the machine code. The mnemonic is the text that humans easily understand (i.e. NOP). The machine code is the bytes the computer understands (i.e. 0x90, or 144 in decimal). Freezing it is meaningless since the instruction shouldn't change anyways, and setting it to 0 will probably do something very bad since that will change that instruction and possibly others down the line.