All things speed runs. I have a playlist of ones I consider well rounded for gameplay and commentary. Really love IGN doing this "reacts to speed runs" series with devs and such. Half Life 2 speed running is seminal and Valve programmers seem chill so this has been a blast:
www.youtube.com/watch?v=sK_PdwL5Y8g
Love their insight, like talking about working on Half-Life Alyx and dealing with Half-Life 2 hard coded bug fixes that got imported in.
