The phrase refers to codes used in conjunction with a peripheral device that modifies a video game’s programming. Specifically, this pertains to the Super Metroid game, and the device, known as a Game Genie, altered game code to introduce advantages or modifications not natively present. An example includes codes that grant invincibility or enable access to areas typically locked until later in the game.
The popularity of these codes provided enhanced accessibility and personalized gameplay experiences. Players who found the original game overly difficult or desired to experiment with its mechanics could use these codes. Historically, this practice represents a form of user-driven modification predating modern modding communities and demonstrates the desire for player control over the gaming experience. They also allowed for exploration and discovery, uncovering hidden aspects of the game.