Note: It's much better to use OpiWiki's items -> ranking to handle such questions. The ranking has been created: Best Valve games of all time.

VALVe is an American video game development and digital distribution company headquartered in Bellevue, Washington, United States. More: opi.wiki.

Half-life Half-life: Opposing Force Half-life: Blue Shift Half-life: Decay Half-life: Day One Half-life: Uplink Half-life 2 Half-life 2: Lost Coast Half-life 2: Episode One Half-life 2: Episode Two Half-life 2: Deathmatch Portal Portal 2 Team Fortress Classic Team Fortress 2 Left 4 Dead Left 4 Dead 2 Counter-Strike 1.6 Counter-Strike: Condition Zero Counter-Strike: Source Counter-Strike: Global Offensive Day of Defeat Day of Defeat: Source Dota 2 Deathmatch Classic Ricochet Alien Swarm see voting resultssaving...
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Jul 14, 2016

Counter Strike 1.6 ( which i'm still playing every day) and Condition Zero ( the classic of CS actually)

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