 The Halo franchise has been highly successful commercially and critically . During the two months following Halo : Combat Evolved 's release , it sold alongside more than fifty percent of Xbox consoles and sold a million units by April 2002 . Halo 2 's sales generated US $ 125 million on its premiere day , making it the fastest selling United States media product in history up to that time . Combined with Halo 's sales , the two games sold 14 @.@ 8 million units before Halo 3 's release . 
