The quality measure comes from SteamDB and the popularity measure comes from SteamSpy API. Therefore, the score of a game is defined as the product of a quality measure (its Wilson score) and a decreasing function of a popularity measure (its players total forever). A 'hidden gem' is defined as a high-quality game (hence the 'gem') which only got little attention (hence 'hidden'). This post contains a ranking of Steam games, based on a score intended to favor 'hidden gems'.
