Counter-Strike PC game

Counter-Strike is a tactical first-person shooter video game which originated from a Half-Life modification and features real-world weapons.

Counter-Strike pits a team of counter-terrorists against a team of terrorists in a series of rounds. Each round is won by either completing the mission objective or eliminating the opposing force.

The game has both individual and multiplayer options. Bots can be added into the game.
The online-multiplayer option is activated via Steam.

Other than similarities in basic gameplay, Counter-Strike is not in any way related to Half-Life.

The original version was marketed as a commercial mod, but since then it has grown into a separate game in itself.