Electronic Tic-Tac-Toe
Here is a DIY Electronic Tic-Tac-Toe game that uses a few microcontrollers and some RGB LEDs. “RGB LED game to play Tic-Tac-Toe for two players. Uses 2 AVR Microcontrollers: Mega16 and Mega8. RGB LEDs allow each user to choose his/her color to represent Cross/Nut.”