Hardcore Multiplayer
Instead of playing regular Team Deathmatch, try out Hardcore. You don't need to use Stopping Power since your health is lower, allowing a great second Perk, like Cold-Blooded. It is also so much more rewarding as a sniper, because there is no kill cam, so they can't see where you are. It does encourage camping, but Hardcore is still much more fun than regular Team Deathmatch.
More tricks, tips and cheats for this game are right here - Call of Duty: Modern Warfare 2 cheats
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