You are the last of your kind. Bred for combat, built for war. You will fight on foot, in vehicles, in the air and beneath the surface of a mysterious alien ring orbiting in the depths of space. Recognized as one of the greatest achievements in video game entertainment, the Xbox version of Halo has already sold over 3 million units and continues to be a top seller. The Macintosh version adds 16-person online multiplayer, new vehicles, new weapons, new maps, customizable multiplayer games, the precision of playing with a mouse and keyboard and more.