Links for all homemade game consoles are below:
Tetris:Original project and thanks to author for sharing:
Juego Arduino Tetris con Matrices LEDs 8×8 + Red Mod
16×2 lcd game console:
Codes for all games can be found here:https://github.com/dadecoza/arduino-lcd-keypad-shield-games
Thanks to Alojz Jakob for sharing this project,on his website
you will find source code and schematic.