Challenging Multiplayer Modes – Modern Warfare 2 will contain a wealth of multiplayer modes including: the every man for himself action of "Free-for All," the classic team-based fun of "Capture the Flag and the tactical, team-oriented action of "Search and Destroy."
Improved AI Enemies – Improved artificial intelligence now allows enemies to attack from virtually any direction as players respawn into the game adding additional challenges.
An All-new Call of Duty
The 'Special Ops' Optional Co-op Mode – "Special Ops" Mode allows two players, either alone or with a friend, to engage in unique mission play and features split-screen functionality.
Diverse In-game Environments - Battlegrounds traversed in the game range from the lonely, snow-clad mountains of Kazakhstan, to dark tunnels in the Afghanistan and the crowded slums of Rio.
Nonstop Action - Modern Warfare 2
New Breach Gameplay Mechanic - Players can now blaze their own paths through the game by "Breaching" formerly impregnable obstacles like walls and doors with explosives.
New Gadgets, Weapons and Weapons System Modern Warfare 2
New Perks and Increased Customization - Multiplayer modes feature new perks for leveling up, and for killstreaks and deathstreaks. Those awarded for streaks can customized in advance according to when they become available.