The listing, Nintendo 64 transfer pak has ended.
This adapter will allow you to insert a Game Boy or Game Boy Color cartridge into the controller and transfer data with the Nintendo 64.
It is compatible with Pokemon Stadium, Pokemon Stadium 2, Mario Golf, Mario Tennis, and Perfect Dark.
Pokemon Stadium 1&2: Import your own Pokemon for battle in-game, play your GBC game on the big screen with Pokemon Stadium's built-in emulator.
Mario Golf: Upload characters and data from the Game Boy version, letting you play as these characters in full 3D. Also, data from the Nintendo 64 version is saved onto the Game Boy Color version of the game.
Mario Tennis: Same as Mario Golf except features and content are unlocked, including: Some N64 characters can be sent to the Game Boy Color Version, GBC characters can be transferred to the Nintendo 64 version, and several courts are also unlocked in the N64 version.
Perfect Dark: Unlocks bonuses between the GBC version and N64 version.