These alphanumeric strings modify the original programming of the classic Nintendo Entertainment System title, Super Mario Bros., allowing players to alter gameplay elements such as character abilities, game difficulty, and even visual aspects. For example, a specific sequence might grant Mario invincibility, infinite lives, or the ability to jump significantly higher than initially designed.
The widespread availability and use of these codes injected a new layer of replayability into the game. Players could experiment with different combinations to discover unique and often bizarre effects, circumventing challenges, or simply experiencing the game in unconventional ways. This phenomenon extended the lifespan of the title and fostered a sense of community among players who shared their discoveries and creations. The emergence of these codes also highlights the ingenuity of reverse engineering and its impact on player engagement with video games.