If you grew up playing video games in the 90s or early 00s, you’ll probably remember how common cheat codes were. Some cheat codes were designed to give you an advantage such as unlocking future levels, making you invincible or providing you with free money. New testing methodsMany of the first cheat codes were introduced by developers as a way of easily debugging games. Being able to use cheat codes online would render most games unplayable. The few games that kept cheat codes instead made them only unlockable after completing certain challenges.