The first part of this project has some important context about how this study was conducted.
As a bonus today I have system infographics summarizing some of the information I’ve gone over so far. It’s nice to directly compare systems on a variety of statistics.
There is some important information about how these numbers were obtained in the other parts of this project, please see Part 1 if you haven’t already.
MobyGames.com for genres, some release dates, some ESRB ratings, and some ESRB content descriptors
HowLongToBeat.com for main story and completionist times.
ESRB.org for ESRB ratings and ESRB content descriptors
Wikipedia for its many lists of games