The Halo 4 estimated week one sales are in from VGchartz which suggests the game has sold an incredibly high number at launch. The estimated sales numbers suggest a whopping 3.1 million units sold at retail – this is not to be confused with numbers shipped to retail which will undoubtedly be a lot more. It’s suggested that if the numbers are accurate then Halo 4 will have seen a 15 per cent increase in week one sales over Halo Reach and Halo 3.