Year Game Developer Note(s) 2015 Dota 2 Valve Ported from Source in 2015; originally released in 2013 2016 Robot Repair A tech demo included within The Lab; the rest were created using the Unity engine[26] 2018 Artifact 2020 Dota Underlords First released in early access in 2019 Half-Life: Alyx Made for virtual reality headsets TBA Sandbox Facepunch Studios Stylized as S&box. Development shifted from Unreal Engine to Source 2 in 2020.[27]