The newest promotion by Microsoft can let you win one of five custom Xbox 360s.

The way you enter is simple. Download a special gamer pic and put it on your profile before hopping into a multiplayer game of Halo 4, Tomb Raider or Gears of War 3 between now and March 11. In addition, you can also enter by downloading HBO Go.

The special 4GB Xboxes up for grab are designed after Tomb Raider, BioShock Infinite, Gears of War: Judgment, Splinter Cell Blacklist and Game of Thrones.