My favorite action game is Call of Duty 4. It is better and more skillful FPS than Halo's online. The multiplayer portion of this game provides many game modes. It contains a leveling system that allows the player to unlock additional weapons, weapon attachments. It won numerous awards from gaming websites, including IGN's "Best Xbox 360 Game". It was the top-selling game worldwide for 2007. I liked this game very much.