will knock out the target. It is still possible for an unconscious enemy to die if shot, dropped from a considerable height or dropped into water, no matter how shallow. Fisher also has multiple types of grenades. There is a gas grenade, which emits a cloud of CS gas that knocks enemies unconscious, a smoke grenade, which provides Fisher with a cloud of smoke to hide in, the flashbang, which will temporarily blind and deafen any enemy near it, and the fragmentation grenade, which will kill any enemy within its blast radius, and send objects flying in all directions. Multiplayer Chaos Theory features competitive and cooperative multiplayer. The cooperative mode expands play by allowing two agents to play through a unique seven-mission story mode that parallels the single-player campaign. It is playable via system link or over Xbox Live. The cooperative campaign follows the story of two Splinter Cells in training, merely known as Agent One and Agent Two. Their training is interrupted when a world crisis occurs that requires the Shadownet division of the NSA to deploy additional resources, even including agents not adequately trained. The missions become a trial by fire for the two new agents. Though players can operate alone, the level design is such that it encourages teamwork. Ubisoft eventually developed two additional levels for download for the PC and Xbox versions. The Nuclear Plant and UN Headquarters missions are meant to end the story for the cooperative component. In Splinter Cell Chaos Theory VS mode, two additional gameplay modes have been added to the game. New game modes include disk hunt, which consists of spies grabbing disks placed throughout the level, then returning the disks to their extraction point. The other game mode is deathmatch, which consists of killing players on the opposite team-spies or mercenaries. The Spy vs. Mercenary game mode returns from Pandora Tomorrow with many improvements. These include new gadgets for both teams, cooperative moves for the spy team, and improved close-quarters combat for the mercenaries. Spies are armed with non-lethal weaponry and rely on stealth, skill, and gadgets. Spies can only kill mercenaries by breaking their necks, dropping on them, and hanging from a ledge and pulling them down. The spies' gadgets also do not generally affect other spies. Mercenaries are the heavily armed enemies of the SHADOWNET spies. Plot In June 2007, tensions are running high between China, North Korea,