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In page Cheating in video games:

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Somewhat more unusual than memory editing, code injection consists of the modification of the game's executable code while it is running, for example with the use of POKE commands. In the case of Jet Set Willy on the ZX Spectrum computer, a popular cheat involved replacing a Z80 instruction DEC (HL) in the program (which was responsible for decrementing the number of lives by one) with a NOP, effectively granting the player infinite lives.[1] On Microsoft Windows, a common type of video game hacking is through the use of DLLs. Users use a third party program to inject the DLL into their game of choice.[2]