Stop wasting paper! Now you can play Tic Tac Toe on your Android device for free. Tic Tac Toe Free is the best-selling mobile Tic Tac Toe game of all-time. "Tic Tac Toe Free remains one of the top free apps on iTunes because you get exactly what you paid for - a classic game of Tic Tac Toe." The AI for one player mode includes three difficulty levels, so you can play against a computer in the next update and match your skill level.