"SWAT 4 is a tactical first-person shooter computer game developed by Irrational Games and published by Vivendi Universal Games on April 5, 2005. It was built on Irrational Games's Vengeance engine powered by Unreal Engine 2.0 technology. In SWAT 4, the player leads a SWAT tactical element in resolving various situations, such as hostage standoffs or apprehensions of dangerous subjects." - Wikipedia
Swat 4 is an amazing FPS game for the PC, although released in 2005, when the graphics are turned up to "Very High", the game looks purely amazing!
Single player: You are the captain of your swat team, you are sent on various missions, involving hostage rescues, raiding drug houses, etc. You have a wide array of wepons to choose from, be it less-lethal or not (although you get more points to arresting suspects, and are penalized if you kill a suspect that did not represent a threat to you). It is overall a very realistic and fun game.
Multiplayer: Multiplayer is available through player hosted servers, which there are tons to choose from. Its like single player, except you choose weather you want to be Swat or a Terrorist (like CounterStrike)

Tusserte - 6/15/2009 (reply)
This game sounds interesting... I'm surprised I've never heard of it! It sounds a little bit like Counter Strike or Rainbow Six; how would you compare it to those games?