Tic Tac Toe XO - Block Puzzle is a strategy game that challenges your logic and brain. It is one of the most popular logic games around, and it has been played by millions of people. The goal of the game is to get your opponent to give you five marks in a row, which will win you the game. The game is played on a grid that has a lot of free space. Each player will take turns and place the five marks in a row, either in a horizontal, vertical, diagonal, or in a L-shape. The players will also have to try to block their opponent from placing any marks in the same spot. The winner is the player who gets five marks in a row first.