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Players can also purchase equipment from the Black Market (previously known as the Nexon Cash Shop) using NX (Nexon Cash) that is bought with real-world money. Equipment includes weaponry, weapon attachments, and accessories for one's character.
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Completing objectives, killing other players, and levelling up one's rank gives the player money in the form of Gear Points (GP), which can be used to purchase new equipment. Combat Arms uses a player ranking system based on total experience, using common military ranks that players can obtain. During the 2009 winter season of the game, a special mode known as Snowball Fight was introduced, but was later removed. The game offers many different modes of play, including One Man Army, Elimination, Capture The Flag, multiplayer co-op (known as Fireteam), Quarantine Regen, Elimination Pro, Search and Destroy, Seize & Secure, Spy Hunt, Bombing Run, and Hired Guns. Combat Arms gameplay is similar to commercial games such as Mission Against Terror, CrossFire, Counter-Strike, Ghost Recon 2 and Call of Duty.
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