Valve has suffered the biggest asset leak in the company's history, after a series of asset repositories for its games from 2016 were released online. The games are Portal, Counter Strike: Source, Day of Defeat: Source, Half Life 2: Episodes 1 & 2, Half-Life 2 multiplayer, and Team Fortress 2...
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Biggest leak in Valve's history includes pretty much everything from Half-Life 2, Portal, and Team Fortress 2
Source: PC Gamer (opens in a new tab)