1) sign up for an account with Nexon.com
2) download game
3) ENJOY!

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IGN - A highly-customizable, free-to-play online FPS, Combat Arms deploys players into a dangerous war zone teeming with soldiers of fortune looking to make a mark. This online shooter aims to advance the FPS genre by offering a rich free-to-play experience and introducing customization features unavailable in the current generation of online FPS games. Players have the ability to tailor their gaming experience by customizing how their characters look as well as which guns and equipment to carry into battle. A large arsenal of deadly weapons can be modified with attachments such as silencers, scopes and extended magazines.

Wikipedia - a multiplayer game, free-to-play modern first-person shooter developed by the South Korea-based developer Doobic Studios, and published by Nexon.[1] The game uses the Lithtech game engine to produce its graphics. In July 2012, Combat Arms was released on Steam.

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