A series of alphanumeric strings, when entered into a peripheral device, modify the behavior of a classic 16-bit video game. This functionality allows players to alter game mechanics, such as granting invincibility, infinite lives, or skipping levels, by manipulating the game’s underlying code. For instance, inputting a specific sequence could eliminate enemy encounters in a particular stage.
The practice provided an early form of user-generated modification within video games, predating modern modding communities. It permitted players to overcome difficult sections, experiment with different gameplay experiences, or simply explore the game world without typical limitations. These modification techniques became popular due to the challenge presented by the original game and the desire to tailor the experience to individual preferences.