Prism: Guard Shield
In Mission Mode, you are briefed on the current terrorist threat and given specific mission objectives to complete to progress through the game. In cooperative multiplayer mission mode, players fight on the same team against the game’s AI. Players choose their specific set of objectives at the start of the mission and your teammates may be needed to accomplish it. There is also a Tactical Combat Mode which is a typical one-on-one or team vs team deathmatch.
There's 7 characters with 3 unique enemy types and you can use 8 near-future weapons. Silenced weapons and a Taser stun-gun allow for silent stealth kills. You can also use "Night Vision" capability to surprise your enemy in the dark. The game also offers unique features such as a Hover Camera which you can command, and a Picture-In-Picture capability.
On November 26, 2008 release 3 came out with extra weapons and more levels for a total of 5 single-player (including at an airport, train station, and oil refinery) and 5 multi-player (including at a football stadium and on an island).