These alphanumeric strings altered the behavior of the Super Mario video games on platforms like the Nintendo Entertainment System and Super Nintendo Entertainment System. Inputting these codes, generated by a device known as the Game Genie, enabled players to modify aspects of the gameplay, such as character abilities, game difficulty, or starting levels. For instance, a code might grant Mario invincibility or an unlimited supply of lives.
The use of these modification strings provided players with increased control over their gaming experience. This allowed for easier navigation through challenging sections, exploration of previously inaccessible areas, and, in some cases, discovery of hidden content. The Game Genie’s popularity arose from its ability to circumvent the intended programming, effectively offering a personalized, and sometimes significantly easier, playthrough. This functionality also served to extend the lifespan of the games by providing novel and varied experiences beyond the original design.