High Quality Content by WIKIPEDIA articles! GameShark is the brand name of a line of video game cheat cartridges and other products for a variety of console video game systems and Windows based computers. Currently, the brand name is owned by Mad Catz, who actively markets GameShark products for the PlayStation, Xbox, Nintendo, and Sega game consoles (see below). Players load cheat codes from Gameshark disks or cartridges onto the console`s internal or external memory then the game is loaded and the selected cheats are applied.