"Halo 3" sales reached $170 million within 24 hours, making it the biggest selling entertainment product launch in US history. It beat the previous record set by Halo 2 in 2004. It was the best selling video game of 2007 in the US, despite only being available on Xbox 360. On January 3, 2008 Microsoft announced "Halo 3" has sold 8.1 million copies worldwide.