This is Shareware Heroes, a new book that has behind the scenes tales from studios like id, Epic and Apogee as they blazed a free-to-try trail across the PC market in the 80s and 90s.

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This mini-doc about Doom’s cheat codes is fascinating. It’s the first episode of a new YouTube series called Codex, and it delves into how Doom’s particular cheat codes impacted everything from future cheat codes in other games to speedrunning and modding scenes.

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