Neocrisis - Halo was Xbox's staple game in the early days. It was the driving force behind the success of the Xbox. Halo 2 solidified the Xbox's spot among the top game consoles, beating out the Playstation 2 in sales across the USA. Halo 3, being the newest release, and the supposed last installment of the Halo series, has enjoyed a ridiculous amount of success. According to Wikipedia, "Halo 3 grossed $300(US) million in its first week. More than one million people played Halo 3 on Xbox Live in the first twenty hours. As of January 3, 2008, Halo 3 has sold 8.1 million copies, and was the best-selling video game of 2007 in the US."