Nintendo Four Player Adapter (DMG-07)
Summary
The Nintendo Four Player Adapter allows you to connect four Game Boy. Each Game Boy is connected to the hub with a cable. Since there were not many buyers for the hub, among other things because the game must be installed on every Game Boy, there were also few games that actively support the multiplayer operation: F-1 Race, Wave Race, Top Rank Tennis.
Video: http://www.metacafe.com/watch/9322771/cgrundertow_game_boy_four_player_adapter_accessory_review/
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