Click on an animal to add it to your tug-of-war team. When you and the computer have both selected three then the match will begin. The winner of the game is the first one to win seven matches. New teams are selected for each match and the computer always picks first. You'll be able to see the pull strength of each animal by mousing over. However, the computer is only looking at the win-loss statistic to pick its team. As you play it will learn which animals make the best players.