super smash bros for nintendo 3ds and wii u

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In 1997 Nintendo developed an attachment for the NES that was capable or KNITTING SWEATERS!

The user could make their own designs on the NES and then have the attachment knit the entire sweater within a few hours.

Nintendo pitched the idea to Toys R Us who decided not to buy into it. A prototype was displayed in the 1987 Winter Consumer Electronics Show to gauge retailer demand.
It’s believed the there were only ever two prototypes made but it’s unknown if they were destroyed or might still be out there somewhere.