Halo 3 , the third game in the best selling Xbox game franchise Halo , is a highly-anticipated first-person shooter video game under development by Bungie Studios for the Xbox 360. An official announcement on the developers' website states that Halo 3 will end the current story arc of the Halo trilogy. A public beta test will be available in spring, with the full game coming out some months later. Release Date: 09/25/07