Tic Tac Toe - by YY is undoubtedly the best Tic Tac Toe app available on the App Store. The game boasts a clean and elegant design that is visually appealing and easy to navigate. With super smooth game animations and sweet sound effects, you'll find yourself hooked from the moment you start playing.

What sets this app apart is its variety of game modes. In addition to the classic mode, you can also enjoy endless, round, and time modes for a one-player game. The clever AI ensures that you'll never feel bored or unchallenged. As you progress and achieve higher scores, the game becomes even more challenging.

The app also offers social features, allowing you to share your scores through Twitter with your friends. You can also challenge your friends by competing on the Game Center leaderboard, adding a competitive element to the gameplay. Additionally, there are 15 interesting achievements waiting for you to complete, adding an extra layer of fun and motivation.

For those who prefer playing with a friend, Tic Tac Toe - by YY supports two-player gameplay. You can save all your game history and track your statistics, making it easy to analyze your performance and improve your gameplay.

If you're not satisfied with your win percentage, you can easily reset all your data and start over again. This feature ensures that you always have a fresh start and can continue to challenge yourself.

Overall, Tic Tac Toe - by YY provides a fantastic gaming experience with its sleek design, smooth animations, and various game modes. Whether you're playing alone or with a friend, this app guarantees hours of entertainment. Download it now and enjoy a wonderful time!