Counter-Strike: Source is a remake of the original Counter-Strike, running on the Half-Life 2 Source engine. It is a tactical action game, challenges you to compete with and against cunning AI opponents in mission-based campaigns spread across the globe. As squad leader of an elite counter-terrorist operative, use specialized maneuvers and weapon skills to complete over 20 new missions, each containing numerous objectives. Drop into challenging scenarios -- from harsh jungle environments to severe arctic terrains, from unforgiving deserts to dangerous international city streets. Rescue hostages. Escort VIPs to safety. Locate and defuse bombs. This collection of entirely new episodes challenges your ability to think quickly and strategically. Features highly-detailed models, atmospheric enhancements such as snow and rain, and many more dynamic special effects.