Counter-Strike, or more commonly known to the world as just CS, is the very first game in the popular online multiplayer series known as Counter-Strike. The game was ported to Xbox in 2003, and it fully launched on the OS X and Linux in April 2013.

In this game, which was originally a mod, players pick teams, either the terrorists or the counter-terrorists, and they try to accomplish their missions.

Terrorists have to do as their name describes best, conduct various heinous acts and entice terror. Terrorists will try to plant bombs and take hostages, while the other team tries to stop them. Players that pick the Counter-terrorists have to prevent the terrorists from accomplishing their missions, so your job will be to defuse bombs and save hostages.

At the end of each round in this game, players get rewarded. Your rewards will increase in accordance with your performance in the previous match, and the in-game currency that you get is used to buy more powerful weapons.

Counter-Strike was a mod for Half-Life and it was created by two people, Minh "Gooseman" Le and Jess "Cliffe" Cliffe. Later down the line, the game's intellectual property was claimed by Valve Corporation, the developers of Half-Life, the game whose assets were used when this mode was first created.