If someone dared Nintendo to make the smallest handheld console imaginable, the results would be the FunKey S, a keychain-sized retro gaming machine that can emulate more than 10 different classic consoles. Only this console wasn’t made by Nintendo—instead, this pint-sized device was created...

When the original Game Boy arrived, so did hundreds of accessories designed to improve its gameplay experience, including oversized lenses to help magnify its small screen. For the Arduboy Nano, however, you’ll have a better chance at getting the next high score if you stick it under a...