A GameShark is a device used to hack the coding of many games, including games in the Legend of Zelda series, enabling the ability to cheat. It is used to create cheat codes such as infinite health and infinite Magic. Although the Gameshark is meant to help players, it is also responsible for crashing many Zelda games. It is currently owned by Mad Catz, a company that produces game-related products.
Video game consoles
Nintendo Entertainment System | Super Nintendo Entertainment System | Nintendo 64 | Nintendo 64DD | Nintendo GameCube | Wii | Wii U | Nintendo Switch
Game Boy | Game Boy Color | Game Boy Advance (Game Boy Advance SP, Game Boy Micro) | Nintendo DS (DS Lite, DSI) | Nintendo 3DS
GameShark | Satellaview | Expansion Pak | CD-i | Wii Zapper