Ancient Greek playwright Sophocles once declared, "I would prefer even to fail with honor than to win by cheating." The rest of humanity learned early on that peeking through their fingers while counting to 100 was helpful when the time came to ferret out their hidden friends.
Every game has rules and a means of breaking those rules. Videogames, which are among the most complex games on the planet, feature suitably complex means of cheating. There are in-game codes, hacks, mods, code-altering devices, algorithms, walkthroughs, and many other means of breaking down a game in order to do what you're not supposed to do.