The marketplace is filled with 'Game Boy Clones' and cases that add a 'Tiny Game Boy Micro' to the pack of your smartphone, but now Nintendo themselves has registered a US patent for a plastic shell which encases your phone in a Game Boy-shaped case, complete with working buttons.
This is something more than a standard case, with buttons that cleverly react with your device's touchscreen beneath to register commands.
A window in the design lets you see a Game Boy screen-sized portion of your own smartphone - the patent mentions it would be here that the game you are playing is displayed - or you can open up the front of the case to see the rest.
It begs the question - when will Game Boy emulation come to iOS and Android? Because this case looks ready made for it.