Tic-tac-toe 1vs1 is a simple and free puzzle game developed by Stéphane Mathis for Android devices. It allows you to play against the computer or with another player on the same phone, via Bluetooth or online via Play Games.

One of the most interesting features of this game is the ability to keep track of your score with achievements and leaderboards from Play Games. The app also has a nice interface that you can personalize with a Holo Light or Holo Dark theme.

Overall, Tic-tac-toe 1vs1 is a great way to pass the time and challenge your friends to a quick game of tic-tac-toe. It's easy to use and doesn't contain any ads, making it a great choice for anyone looking for a simple game to play on their Android device.