[Circuitchef] used gates and a few flip-flops to build a two-player electronic Tic-Tac-Toe ... is using becomes unavailable. He provides a nice block diagram which helps to understand the game ...

Tic-tac-toe ... game board consists of a small whiteboard on which the robot and the human can draw their O’s and X’s. The mechanical structure of the robot looks a bit like a tiny human using ...