Counter-Strike 1.6

Counter-Strike is team-based, and casts players in the role of terrorist or counter-terrorist. Each team has access to different ammunition and equipment, and each player has unique attributes and the ability to upgrade their gear as they successfully complete each mission. A growing number of missions are available, each having specific goals, such as rescuing a hostage or eliminating key enemy structures.

Since it's initial Beta release in Fall 1999, Counter-Strike has taken multiplayer gaming by storm to become the number one played online action game – surpassing all commercial and non-commercial titles in its class!