https://tinygamecorner.com/

Tutorial:
https://www.instructables.com/id/Arduino-Based-Cartridge-Game-Console/
Updated schematic with 16MHz crystal:
https://tinygamecorner.com/wp-content/uploads/2018/12/schematic-1-1024x735.png

3D printable case:
https://www.thingiverse.com/thing:3239429
If you don't own a 3D printer, you can order prints from Shapeways:
https://www.shapeways.com/product/QDFFTELAJ/tiny-game-corner-case

Source Code for my games that work on TGC:
A-Maze
https://github.com/alojzjakob/A-Maze/tree/master/A-Maze-SH1106
Tamaguino
https://github.com/alojzjakob/Tamaguino/tree/master/Tamaguino-TinyGameCorner-with-SH1106

TinkerCad:
https://www.tinkercad.com/things/ayJ1Hi8w8vB

If you like my work or would like to support my future projects, you can buy me a coffee :)
http://ko-fi.com/A654MLL