These Tic Tac Toe book are blank and easy to get started in the game. In pairs, players take turns writing X and O in the 3 x 3 grid. The purpose of tic-tac-toe is to get 3 in a row in the vertical, horizontal and diagonal directions. Tic-tac-toe is a game for two players. In addition, it improves analytical thinking and strategic thinking. •Pocket Size 6x9 inches,100 pages •600 games to play •Perfect to keep your kids or adults and brain teaser