Tic Tac Toe (aka: Xs and Os,XOXO,XO,Connect 4/3 in a Row) for iOS

Tic tac toe (or Noughts and crosses, Xs and Os) is a paper-and-pencil game for two players, X and O, who take turns marking the spaces in a 33 grid. The player who succeeds in placing three respective marks in a horizontal, vertical, or diagonal row wins the game. The first player has 3 possible positions (corner, edge, or center) to mark during the first turn. First player can win or force a draw from any of these starting marks; however, playing the corner gives the opponent the smallest choice of squares which must be played to avoid losing.The second player must respond to the first player opening mark in such a way as to avoid the forced win. It supports one player (with computer) and two players, so you can play against your friends. ONE PLAYER Mode has three difficulty- Easy: AI move random at any positon - Medium: AI can defend and check two-three in 9 Grids - Hard can defend and offend! Be careful!If you have any suggestions, Send a mail to lioninc@qq.com