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1. Buy at Amazon: Call of Duty: Modern Warfare 2 
Epic single-player campaign picks up immediately following the thrilling events from Call of Duty 4: Modern Warfare. The definitive multiplayer experience returns, with a host of new perks and enhancements. New cooperative SpecOps mode, the perfect combination of Modern Warfare's single-player intensity and the addictive replayability of its multiplayer. The most-anticipated game of the year and the sequel to the best-selling first-person action game of all time, Modern Warfare 2 continues the gripping and heart-racing action as players face off against a new threat dedicated to bringing the world to the brink of collapse.
2. Buy at Amazon: Call of Duty 4: Modern Warfare action-thriller from the award-winning team at Infinity Ward, the creators of the Call of Duty series, delivers the most intense and cinematic action experience ever. Call of Duty 4: Modern Warfare arms gamers with an arsenal of advanced and powerful modern day firepower and transports them to the most treacherous hotspots around the globe to take on a rogue enemy group threatening the world. As both a U.S. Marine and British S.A.S soldier fighting through an unfolding story full of twists and turns, players use sophisticated technology, superior firepower and coordinated land and air strikes on a battlefield where speed, accuracy and communication are essential to victory. The epic title also delivers an added depth of multiplayer action providing online fans an all-new community of persistence, addictive and customizable play.
3. Buy at Amazon: Halo 3 Master Chief reenters Earth’s atmosphere as the desperate struggle between the Covenant, the Flood, and what’s left of the human race comes to a dramatic, pulse-pounding close. Enlist now to experience the award-winning campaign, chart-topping multiplayer, and near limitless community content for yourself.
4. Buy at Amazon: Left 4 Dead This co-operative action horror FPS takes you and your friends through the cities, swamps and cemeteries of the Deep South, from Savannah to New Orleans across five expansive campaigns. You’ll play as one of four new survivors armed with a wide and devastating array of classic and upgraded weapons. In addition to firearms, you’ll also get a chance to take out some aggression on infected with a variety of carnage-creating melee weapons, from chainsaws to axes and even the deadly frying pan.
5. Buy at Amazon: Halo 3 ODST features and additional content including the new campaign experience, the frenetic four-player cooperative Firefight mode, the complete Halo 3 multiplayer experience, and the invitation to the Halo: Reach Xbox LIVE multiplayer beta.
6. Buy at Amazon: Call of Duty: World at War brings an uncensored edge to combat, as soldiers face the most harrowing and climatic European and Pacific battles in which an enemy, who knows no surrender and no retreat, will fight to the last breath, unleashing an arsenal of lethal surprising tactics. Peril and danger lurk throughout the battlefield as players combat the unknown risk of the new chaos of battle. From the remains of Russia and the ruins of Berlin, to the beach and jungles of the deadly Pacific Theater, the volatile action takes on added depth as players employ new features that previously were only-available in multiplayer, including perks, rankings and online stats in up-to full four-player cooperative gameplay. New infantry and vehicle-based weapons, like the potent flamethrower, bring the battlefield ablaze
7. Buy at Amazon: The Orange Box The compilation contains five games, all powered by Valve's Source engine. Two of the games included, Half-Life 2 and its first stand-alone expansion, Episode One, were previously released as separate products. Three new games are also contained within the compilation: the second stand-alone expansion, Half-Life 2: Episode Two, the puzzle game Portal, and Team Fortress 2, the multiplayer game sequel to the Quake modification, Team Fortress. A separate product entitled The Black Box was planned, which would have included only the new games, but it was cancelled.
8. Buy at Amazon: Perfect Dark Zero is a first-person shooter video game developed by Rare and published by Microsoft exclusively for the Xbox 360 video game console. It was released as a launch title in North America, Europe, Australia and Japan. Perfect Dark Zero is a prequel to the successful Nintendo 64 game Perfect Dark, made in 2000. Zero takes place in the year 2020, predating the original Perfect Dark's storyline by three years. Two sequel novels have been released so far, Initial Vector and Second Front, which continue the story of Joanna Dark.
9. Buy at Amazon: F.E.A.R. simulates combat from a first person perspective. The protagonist's body is fully present, allowing the player to see his or her character's torso and feet while looking down. Within scripted sequences, when rising from a lying position or fast-roping from a helicopter for example, or climbing ladders, the hands and legs of the protagonist can be seen performing the relevant actions.
10. Buy at Amazon: Borderlands features four player online cooperative play, which allows players to join and leave games whenever they want to, along with other single-player and multiplayer modes and a large number of weapons. Players can choose from four different playable characters who each have their own unique abilities and skill trees. In addition, players may have access to customizable vehicles for "vehicular combat" and will also be able to customize their pre-selected character. Defeated enemies will sometimes drop equipment, which is then available for players to pick up. The game is described by Gearbox Software as an "RPS," or "role-playing shooter."
