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Valve's two-hour documentary for Half-Life 2's 20th anniversary, with team members discussing development, nearly running out of money, being hacked, the publisher lawsuit and the birth of Steam.

Modern Vintage Gamer explains how Eric Chahi built Another World on the Amiga 500, using 2D polygons, rotoscoping and clever techniques to run well on a stock 7MHz machine.

A Noclip Greatest Hits documentary on the legacy of RollerCoaster Tycoon, covering its original design, Chris Sawyer and the OpenRCT2 community that keeps it alive.

A Gaming Historian documentary on the creation of Super Mario Bros. 3, the hype around its release and why it is regarded as one of the greatest games. It runs about 50 minutes in three parts.