Rainbow Six: Lockdown

From Rainbow Six Wiki

The fifth instalment in this prolific series is as usual developed by Red Entertainment. An evil, freedom-hating terrorist network is planning to kill millions of innocents using an advanced nanotechnology virus. Rainbow, the zero-tolerance anti terrorist squad have been called in to put a stop to this nonsense. Players will experience close-quarter, split-second decision gameplay, playing either as Ding Chavez, the heroic team leader, or Dieter Weber, the reliable if arrogant team sniper. Lead the Rainbow team's highly skilled operatives, all tooled up with the most advanced equipment available.

The game features typical new FPS technology: a new graphical engine, ragdoll physics and heightened enemy AI. As you'd imagine for a tactical FPS, the game also supports full online play, and should delight fans of Tom Clancy games.