Demonstration of the finished product can be found in this youtube video: https://www.youtube.com/watch?v=IIJF_dRzras&t=55s Instructions to make this can be found in this link. https://www.instructables.com/id/Credit-Card-ATtiny-Game-Console/ I was inspired by the mini game consoles based on the energy efficient ATtiny85 MCU. There are several retro-game console designs: The Attiny Joypad created by Daniel Champagne.. (Electro L.I.B) 2018 GPL V3 is a great platform with the 4 way directional buttons/joystick and another fire button . The other platform called Attiny Arcade created by webbloggles is also a great mini game console with the simplicity of having only two buttons. Both platforms inspired me to create something taking the best from both worlds. This version of the game board I called “gametiny” is based on the Attiny Joypad created by Daniel Champagne. I modified it to add a header for USBasp programmer that doubles up as a socket for the game cartridge which contains an ATtiny85 chip. You can make a few game cartridge and load up your favourite games so you can swap the games on your trip. The ATtiny85 is very energy efficient. You only need one CR2032 cell battery to play games for hours. Besides the A button which is usually used as the fire button, I added a B button to pull PB3 to ground. This allows the interrupt codes to work for both PB1 and PB3, making it easier to convert games written for the Attiny arcade to work on Attiny joypad. Links Original Tiny Joypad design by Daniel Champagne. https://sites.google.com/view/arduino-collection Original Attiny Arcade keychain kit http://webboggles.com/attiny85-game-kit-assembly-instructions/ Arduino board driver for attiny85 https://raw.githubusercontent.com/damellis/attiny/... schematics and source codes in https://github.com/cheungbx/gametinyem