Halo 3: ODST
Halo 3: ODST is a first-person shooter video game developed by Bungie for the Xbox 360. Halo 3: ODST was released worldwide on September 22, 2009. The game is a prologue to Halo 3, which fills in the details of what happened in southeastern Kenya from Halo 2 to Halo 3. - Summarized from Halo Nation.