Source

ObjectComputing
Valve's 3D game engine, introduced in 2004
1.60Rare

Valve's 3D game engine, introduced in 2004
Rare
Source, also called Source 1, is a 3D game engine developed by Valve. It debuted in 2004 as the successor to GoldSrc, with Half-Life: Source, Counter-Strike: Source and Half-Life 2. Valve used it for games including Team Fortress 2, Dota 2 and Portal. Third-party Source games include Vampire: The Masquerade – Bloodlines, Dear Esther, The Stanley Parable and Garry’s Mod. It was succeeded by Source 2 in 2015.
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