Cheating has been in games since almost the beginning. In the early days, video games were hard so kids would feed more quarters into arcade machines. So early video game developers would work in little codes to test their games more easily. For example, the most well-known cheat from that era was the Konomi Code, put into the NES port of

Source: Hot Hardware – Call Of Duty Anti-Cheat God Mod Is Just What You Need To Beat Down Lame Hackers