This past Saturday marked the 20th anniversary of id Software’s legendary FPS game, Wolfenstein 3D. To commemorate the anniversary, id Software co-founder John Carmack provides director’s commentary for the game. Additionally, at wolfenstein.bethsoft.com, you can relive all the glory of id’s seminal shooter with a free-to-play browser version of the game. And for limited time, iOS users can download Wolfenstein 3D Classic Platinum for free on iTunes.