Released in 1998 for the Game Boy and Game Boy Color, it came preloaded with codes for 158 games. This list was revised with new games with each Gameshark version/revision, as well as the ability to add your own game folders and codes. Codes were saved as a string of HEX values that represented a specific game state or attribute at a specific memory location within the game ROM. When the Game Boy attempted to execute code at said memory address, the Game Shark would overwrite it with its own modified code (Cheat Code). This allowed for everything from invincibility, extra lives, unlimited ammo, rapid fire, sprite modifications, and much more.