Source FilmmakerValveReleased 10 Jul 2012·App 1840Steam user reviewsVery Positive92.9%· 44.2K reviewsRecent Very Positive · 93%SteamPeaks Rating88.5 Very positiveRecent 30 days 89.8How it worksLast seen932Sampled 19 minutes ago · not a live figure—of peakAll-time peak1,837May 2020