The good ol X and O! Tic-Tac-Toe is one of the oldest and simplest games based on logic. A great way to develop quick thinking, it is a brain teaser that requires strategic planning and turn-taking. This game never gets old and is perfect to be a part of your travel kit. Tic-tac-toe even makes an ideal gift, especially for corporates and high-end executives. This set also makes a good showcase item.