[fxm4139]

Wait, why do some of these "cheat" mode exist in production games? Isn't that the problem to begin with? Why does omething like "invincibility" exist in the game? Am I missing something here, or is this a noob question from a non-gamer?

[tlrobinson]

They aren't deliberate "cheat modes", they're hacks. Certain types of hacks are extremely difficult to prevent or even detect.

There was an article on HN a few months ago (can't find it right now) that discussed hooking into the GPU to avoid detection.