Source 2 (Half-Life: Alyx Engine) - 2015

Source 2 is a game engine developed by Valve Software, first used in Dota 2 in 2015.
source
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Source 2 (Half-Life: Alyx Engine)
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Deadlock -
Dota 2 - 2013
Half-Life: Alyx - 2020
Counter-Strike 2 - 2023
Lambda Fortress - 2025