If Half-Life is one of the most influential videogame series in history, it's not only because of Valve, Gordon Freeman, and the actual FPS games themselves. Half-Life and Half-Life 2 are nexus points for a whole generation of PC classics. Counter-Strike began as a Half-Life mod, as did Day of Defeat, and The Hidden. The first Team Fortress was bundled as a Half-Life spinoff. The same Source engine that brings to life City 17 and Ravenholm is also the backbone of Team Fortress 2 and Portal. Originally released in 2007, Zombie Panic Source is another of Half-Life's informal descendants. A spiritual precursor to today's asymmetrical, multiplayer horror games and a staple of mid to late '00s modding, alongside CSGO and Left 4 Dead, Zombie Panic Source is now somehow having a resurgence on Steam.
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