3blue1brown held a contest in 2021 to inspire people to create math explainer videos for a more or less general audience during the isolation of the pandemic. One of the submissions was the very good Hackenbush: A Window to a New World of Math, which dives into combinatorial game theory à la John Conway's Winning Ways for Your Mathematical Plays. Going by the comments under the video, it appears the creator Owen Maitzen commit suicide sometime in the year after publishing the video. It's the only video on the channel. There could have been many more.