Ok ok... Sim city isn't too difficult to hack though
I think to understand this search, you need to understand xor.
Is a basic encryption. And knowing the key encrypts the values, essentially cripples xor.
With this search you tell it how many bytes away the xor key is. This is represented by the value AFTER the X. So, if I search 500X4 I'm saying the xor key is 4bytes away (the dword value above it). So you don't even have to know the key. MOST games the XOR key will be 4 away. A few are 8bytes and then the most complex is Fire Emblem Heroes. If you use device it is X24 and emulator is X48.
Then for editing, to maintain xor, type the value for edit with the correct X4 or X8 etc etc after it.
You cannot choose "freeze" when doing edit, doesn't function correctly with this style edit.