RG Tic Tac Toe Pro app for iPhone and iPad

Play the classic game of Tic Tac Toe with 8 themes to choose from! Play with a friend on the same device, different devices over your local network, or single player with selectable difficulty levels. Play with your device in portrait or landscape orientation.

Tic Tac Toe is a classic two player game where one player is "X" and the other player is "O". The board is a 3x3 grid containing nine playable spaces. The players alternate turns placing their "X" or "O" in any open space on the board. Winning the game is achieved by having three of the players "X"s or "O"s in a horizontal, vertical, or diagonal line. The two players alternate who is "X" and "O" each game and "X" always makes the first move.

This app features:
8 different themes to choose from.
4 Single player difficulty levels from an easier-to-beat beginner to expert mode, which should never lose.
Multi-Player play on the same device or network play with different devices.
Multi-Platform network play on different device types with the app installed.
Portrait and landscape displays are supported.
Statistics for the current session and all games played.

This is the paid version of RG Tic Tac Toe Pro. There is also a free version available which is ad supported.