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Liam Robertson from DidYouKnowGaming has posted a fantastic video about the Game Boy add-on that almost came to be called the "PageBoy". It would've given the Game Boy a ton of additional functionality over wireless transmission, but was scrapped before ever seeing the light of day. Now, twenty years later, we can have a look at what might have been...
https://www.youtube.com/watch?v=Eg6an-Tyxsw