Halo: Spartan Assault is a twin-stick shooter set in the universe of the Halo series of first-person shooter games. In this game, you control soldiers battling a rogue faction of the Covenant in missions set between Halo 3 and Halo 4. These missions include both infantry combat and vehicle action. Playing the game's missions can earn achievements and other rewards that can apply to a character in Halo 4.