A free program for Android, by Popoko VM Games.

Tic-tac-toe (also known as noughts and crosses or Xs and Os) is a paper-and-pencil game for two players, X and O. The game is played on a 3×3 grid, and the player who is first able to make three of their marks in a horizontal, vertical, or diagonal row wins the game.

The AIs of varying difficulties are easy to play and hard to beat.

After making a winning move, you will see the number of points you earned on the top right corner of the screen.

You will also earn experience points by winning against the AIs (+1 for Easy, +3 for Medium, +5 for Hard, and +7 for Expert).