Combat Arms is entirely a multiplayer game with no single-player mode, and contains 4 game modes: Elimination (Team Deathmatch), One Man Army (Deathmatch), Search & Destroy (Bomb mode), and Capture the Flag, and as of now consists of 6 maps: Warhead (factory), Pump Jack (oil station in a desert), Snow Valley, (a missile launch site in the middle of snow-covered mountains), Gray Hammer (factory), Junk Flea (desert junkyard) and Cold Seed (snow-covered mine).
Players who start a room, (known as the Room Master) are able to choose the map, game mode, set score and time limits, and controls the weapons other players can use or not use, (for example, Melee only, or No sniper rifles allowed).
Players are able to obtain in-game money (GP) and experience after a match, allowing them to rank up and buy new weapons and equipment, such as armor, uniforms, and backpacks for their persistent characters. There is a rental system of equipment instead of actual purchases of the weapons and gear. The rental periods are 1 day, 7 days, 30 days, and 90 days, each rental period costing more in-game money.
This rental period has caused much criticism to the game as players are upset that they cannot own weapons that they buy forever and that they have to keep playing to make up for the GP they used to purchase weapons and gear.
The game design was based on a game known as Heat Project, a game made in Korea. The game also uses a customizations system where players can buy silencers, larger magazines, and different types of scopes.
Noob: D'omfg, noob. What is that game you're playing?
L33T Guy: Combat Arms, noob.