Halo is a military science fiction, first person shooter video game that has turned into a multi-billion dollar venture. The gameplay is all about an interstellar war between the humans and the Covenant, which is an imaginative alliance of aliens. The title of the game, Halo, is in reference to the Halo rings. These are large habitable structures that were created by the Forerunner to vanquish any form of sentient life. It is without a doubt one of the best-selling games that are there. To install the complete PC version, you will have to generate a license key using the Halo PC Keygen.