The Hitchhiker's Guide to the Galaxy:An illustrated, on-line playable (Flash) 20th anniversary version.
Adventure Collective review: [4/5] by Joshua Mintzer
BBC Interview with Steve Meretzky: Steve Meretzky talks about Douglas Adams, game difficulty, non-linearity, and deadlines. [Contains puzzle spoilers.]
DouglasAdams.com: The Hitch Hiker's Guide to the Galaxy - The Adventure Game: Play the text adventure on-line using Java on Douglas Adams' website.
Infocom Games: Hitchhiker's Guide: Box scans, introduction, specifications and sample transcript.
Infocom Homepage: HGttG: Description, release information, statistics, and packaging details.
New Zork Times: Don't Panic: Text of game announcement from Infocom's newsletter.
Radio 4 Revives Hitchhiker's Game: A Douglas Adams game is revived to mark a new Hitchhiker's Guide To The Galaxy radio series. [BBC News]
The Infocom Gallery: The Hitchhiker's Guide to the Galaxy: High-quality scans of packaging, manual, "Don't Panic!" button, pocket fluff, demolition orders, and microscopic space fleet.
The Restaurant at the End of the Universe: Stu Galley's explanation of why the sequel was never released.