The TRUTH about the Blue Whale Challenge (aka Blue Whale Game) - a true crime documentary

In 2016 in Russia, an online game which allegedly caused 130+ teenage deaths took the country (and then the world) by storm. This is the story of Filipp "Lis" Budeikin, F57 and its many copycats. What was this game, how did it work, and did it really claim the lives of 130 people? Was it a media-induced moral panic?