Xbox Live users can now download two new Coop missions for Splinter Cell: Chaos Theory.

The two missions are the Nuclear Plant and the UN Headquarters. Nuclear Plant has claustrophobic passages and massive open spaces, with lots of large, loud machinery and puzzles. UN Headquarters gives you the chance to infiltrate one of the world's most protected buildings. This mission requires total invisibility with no room for kills or alarms.

The two missions continue the existing Coop story and bring it to an end. Both missions are playable in Split screen, System Link and Xbox Live gameplay modes.