There's now a GameBoy emulator for the Apple Watch
 

The last place you'd probably want to play a video game is on an Apple Watch. The wearable has a tiny screen, almost no buttons and can only be operated with one hand. It's a completely impractical gaming device, but developer Gabriel O'Flaherty-Chan...

https://www.engadget.com/2017/03/21/...e-apple-watch/