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