As the name suggests, the Transfer Pak allows data, high-scores, characters and other data to be transferred between your Game Boy Color Game Paks and Nintendo 64. There's little that beats the thrill of transferring your Pokémon from Game Boy to Nintendo 64 and cheering them on as they clatter with friends' monsters in breathtaking 3D. Magic!

Look for the Transfer Pak icon on Nintendo 64 and Game Boy Color Game Paks that support this accessory. The full list is:

Nintendo 64 - Mario Golf, Mario Tennis, Mickey's Speedway USA, Pokémon Stadium, Pokémon Stadium 2

Game Boy - Mario Golf, Mario Tennis, Mickey's Speedway USA, Pokémon Red, Blue, Yellow, Gold, Silver and Crystal.