Tic-Tac-Toe classic 3x3 app for iPhone and iPad

Tic-tac-toe (or Noughts and crosses, Xs and Os) is a pencil-and-paper game for two players, X and O, who take turns marking the spaces in a 3x3 grid.
The player who succeeds in placing three respective marks in a horizontal, vertical, or diagonal row wins the game.
Players soon discover that best play from both parties leads to a draw (often referred to as cat or cats game).

The friendliness of Tic-tac-toe games makes them ideal as a pedagogical tool for teaching the concepts of good sportsmanship and the branch of artificial intelligence that deals with the

searching of game trees.

The goal of Tic Tac Toe is to be the first player to get three in a row on a 3x3 grid.

Players alternate placing Xs and Os on the board until either one player has three in a row, horizontally, vertically or diagonally; or all nine squares are filled.

If a player is able to draw three Xs or three Os in a row, that player wins.

If all nine squares are filled and neither player has three in a row, the game is a draw.

There are 3 levels of difficulty + 3 color themes.

2 play modes:
player vs player
player vs computer