The MyPi is a well documented kit that uses a Raspberry Pi 3 running RetroPie to create a large screen handheld retro game system.
Handheld portable device design for routine check (ex, Watchman's clock).
A small, cheap, versatile device that uses WiFi and NFC to interact with surroundings - great for games!
Just a quick showcase on a handheld, wireless and battery operated distance sensor. Incredibly long-life (8 + years!).
Embed a RPi Zero W into a moleskine notebook for a small and portable gaming station or terminal.
I built my own GameBoy using Raspberry Pi and Adafruit components.