Counter-Strike: Condition Zero (Game) - Giant Bomb

Counter-Strike gets a updated look (thanks to a series of development teams) in this 2004 update, adding updated graphics, new bots, and two unique single-player campaigns.

Dahab, Counter-Strike Wiki

Counter-Strike: Condition Zero (Video Game 2004) - IMDb

Counter-Strike: Condition Zero - Valve Developer Community

Counter-Strike: Source, Counter-Strike Wiki

Counter-Strike: Condition Zero Walkthrough - GameSpot

Counter-Strike: Global Offensive - Internet Movie Firearms

Counter-Strike: Condition Zero Walkthrough - GameSpot

Counter-Strike Games - Giant Bomb

Counter-Strike: Condition Zero Walkthrough - GameSpot