Counter Strike Online (CSO) is a free-to-play Counter Strike MMOFPS licensed by Valve Software to Nexon Corporation, released in 2008.

Find out more about all available game modes in Counter-Strike Online or Counter-Strike Nexon.

Start out by checking out the weapons, classes, game modes, unboxing and many more in Counter Strike Online or Counter Strike Nexon.

Download Counter Strike Online (CSO) or Counter Strike Nexon (CSN) with step-by-step tutorial provided.

Discover the list of Player Versus Player (PVP) game modes in Counter Strike Online (CSO) or Counter Strike Nexon, including zombie mode.

Learn more about how Counter-Strike Online or Counter-Strike Nexon works through its user interface.

The complete list of Casual game modes available in Counter Strike Online (CSO) or Counter Strike Nexon (CSN).

Discover the list of Player Versus Environment (PVE) game modes in Counter Strike Online (CSO) or Counter Strike Nexon (CSN).

Find out more about the Terrorist characters in Counter-Strike Online (CSO) or Counter Strike Nexon.

Step-by-step tutorial to download Counter Strike Online (CSO) China, or 反恐精英 Online.