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From Andrei Voinicaru:
Stop wasting paper and save trees - play Tic Tac Toe game on your IOS device for free. Tic-Tac-Toe game supports one player gameplay, so you can play against your IOS device (AI opponent). 3 difficulty levels - The Tic Tac Toe (TicTacToe) game includes three difficulty levels, so you can play against a computer player that matches your skill level. Easy Tic Tac Toe difficulty level: recomended for beginners, computer player makes sometimes stupid moves while playing Tic Tac Toe game. Medium Tic Tac Toe difficulty level: computer player is smart - clasic and also defaut Tic Tac Toe game level. Hard Tic Tac Toe difficulty level: you may win Tic Tac Toe game only when you start game. Tic-tac-toe game strategy: A player can play perfect tic-tac-toe (win or draw) given they move according to: - Win: If the player has two in a row, play the third to get three in a row. - Block: If the opponent has two in a row, play the third to block them. - Fork: Create an opportunity where you can win tic tac toe game in two ways. - Block opponent's Fork: * Option 1: Create 2 in a row to force the opponent into defending. * Option 2: If there is a configuration where the opponent can fork, block that fork. - Center: Play the center. - Opposite corner: If the opponent is in the corner, play the opposite corner. - Empty corner: Play tic tac toe game in a corner square. - Empty side: Play tic tac toe game in a middle square on any of the 4 sides.