Raw Score: This is the average rating that a game receives. If your number of ratings is the same or more than the median number of ratings (13 in this jam) then: Score = Raw score
Score: This is the important one for determining who ranks where. Not every game has the same number of ratings so to balance things out more fairly it takes into consideration the number of ratings as well as the raw score. If your number of ratings is less than the median number of ratings (13 in this jam) then: Score = Raw Score * square root(number of ratings of your game divided by the median number of ratings)