Noughts Crosses n TicTacToe app for iPhone and iPad

Tic-Tac-Toe or Noughts-n-Crosses
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A traditional game for 2 players that is one of the earliest strategy games known.

Players take it in turns, with the player playing X going first.

A turn consists of touching an empty square, which places your X or O in that square. The winner of the 3x3 game is the first player to get 3 of their Xs or Os in a line horizontally, vertically or diagonally. The 4x4 game is similar with the addition that a player can also win by completing a square block of 4 Xs or Os.

Sign in with your Game Center ID and invite friends to play over the Internet or over the local network. When in a match players can chat to decide who goes first, or just to pass the time of day.