Tic Tac Toe - Tris!

"Tic-tac-toe" or "Tris" is a paper-and-pencil game for two players, X and O, who take turns marking the spaces in a 3×3 grid. The player who succeeds in placing three respective marks in a horizontal, vertical, or diagonal row wins the game. When the grid is full and nobody has put in order the three marks, the game is draw. GAME MODES: The app has 2 game modes, and 4 difficulty levels: 1) Human-Vs-Human - Multiplayer: players can challenge each other on the same device. 2) Human-Vs-Computer - Easy: computer makes a lot of mistakes. - Medium: computer makes some mistake. - Hard: computer is stronger. - Impossible: computer can't lose.