Here’s another entry in the 7400 Logic contest. [Circuitchef] used gates and a few flip-flops to build a two-player electronic Tic-Tac-Toe game. The full details or shared in the PDF file he ...

If you Google for “tic-tac-toe” or “tic tac toe,” you’ll also see a playable game in a card in the search results. You can adjust the settings here to Easy, Medium or Impossible.