I have never played Counter Strike: Source until I bought it to download Age of Chivalry on Steam. This certainly was not what I was expecting. : r/gaming
S-PIPE]Counter-Strike: Zombie Extermination [1.2] file - Mod DB
Zombie Horde mod for Counter-Strike: Source - Mod DB
2 Player Skin Packs image - Zombie Riot mod for Counter-Strike: Source - Mod DB
Counter Strike Source - Zombie mod Zombie Horror Boss fight - Online Gameplay on Silent Hill map - YouTube
Steam Community :: Guide :: Zombie Mod for Dummies
Counter-Strike:Source Zombie Escape by iTzStyleZ on DeviantArt