What would it take to build a Game Boy small enough to carry around on your keychain? It turns out that we already have the technology, it just takes a very clever and skilled person to pull it off.
Jeroen Domburg, aka Sprite_TM, did just this, building a key-chain sized Game Boy Color that functions just like the original with a few extra secrets inside.
Based on a color OLED screen, and driven by an ESP32 micocontroller, this tiny Game Boy includes direction pad, buttons, audio, and the ability to load new games wirelessly. Sprite_TM discusses the design and build process in this talk he presented at the 2016 Hackaday SuperConference.