Those of us old enough to remember blowing into cartridges will probably remember the Game Genie – a device that plugs in to an NES, SNES, Sega Genesis, or Game Boy that gives the player extra ...

These are only available if you purchase a Game Genie cartridge for your Sega Genesis, or if you play Sonic 3 & Knuckles on an emulated version of the game. However, they’re worth the extra ...