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Give me your Half-Life takes
(venturebeat.com)
Tabletop, DnD, board games, and minecraft. Also Animal Crossing.
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I'd agree on the last part but I'd also claim that both HLs acting as tech demos for their respective engine does make them incredibly important and meaningful as games. Like it all seems sort of trite now downstream of what happened, but I don't think it would've happened if they didn't do it