 Microsoft spent more than $ 40 million marketing Halo 3 . The goal of the campaign was to sell more Xbox 360 consoles and widen the appeal of the game beyond the " Halo faithful " to casual as well as hardcore gamers . Marketing took the form of stages , including trailers of the game , real @-@ time cinematics , recorded gameplay sequences , pre @-@ rendered CGI , and live action film . On September 12 , 2007 , the " Believe " Halo 3 ad campaign , focused on the epic nature of the story and heroism told through dioramas and third party accounts of Master Chief 's service , began with the video " Museum " and continued on past the game 's release . 
