Super Game Boy
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The Super Game Boy was an adapter for the Super Nintendo that allowed Game Boy games to be played on the system.
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I didn't know about this being available.
There is also the transfer pack for the Nintendo 64. If you had the first Pokemon Stadium game, you could play the Pokemon Gameboy Color games on the TV.
I have the one for the Gamecube. I believe it is called the Game Boy Player. It mounts to the bottom of the GameCube and lets you play Game Boy, Game Boy Color and Game Boy Advance games.