If you think the only way to see awesome 3D graphics while playing Famicom is with Nintendo's 3D System, you're wrong. There are also these fly 3D sunglasses made by Square.

Square's 3D sunglasses were made for use with Tobidase Daisakusen, the Disk System game also made by Square. That game is the same as the NES's The 3-D Battles of World Runner. The glasses were never packaged with the game, but were sold separately, partly as a response to gamers not wanting to shell out the money for Nintendo's 3D System.

Though it might not be worth buying these to play the game, it might be worth it just to wear these glasses around the house, looking cool. They're not especially rare, but can be hard to find outside of Japan. Look to pay less than $25 for new glasses in their packaging and $15 for used ones with no packaging.