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Cheat codes are not intelligent. They simply change a value at a specific address in memory. If the variable you are trying to change is off the expected memory location by one single byte, the code will not work of crash the game. All rips modify executable code to disable DVD checking, possibly moving code to new memory locations.
Here’s what the Codebreaker site also had to say about codes not working:
Sometimes there are reasons beyond our control that could cause a code not to work. Like for example, we had a code posted for Grand Theft Auto 3 for Infinite Health. The code worked for me on every Playstation 2 I had tested it on, yet we were still getting complaints about it not working. I still to this day do not know WHY the code was different for some people very rarely, it could have been model of PS2 and/or memory cards plugged in and the sony libraries could have used more/less memory. But when this happens, the only thing I can do is try and make a better version of the code in assembly language. That seemed to fix this problem for Grand Theft Auto 3 Infinite Health and Infinite Armor.
I’ve tried codebreaker V4, with 4 rips so far, and got 3 out of 4 to work.
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