Following Halo 4's launch on Nov. 6, more than four million Xbox Live users played the game in the first five days, with another million-something completing the main campaign.
The numbers come from the game's official website, Halo Waypoint. Waypoint lists a number of five-day facts, including total hours spent playing Spartan Ops, War Games, kills made and achievements earned. Of those who completed the game within Waypoint's timeframe, six percent did so on the Legendary difficulty setting.
Halo 4 throws Master Chief back into action almost five years after the release of Halo 3. The game is available for Xbox 360.