HHGTTG has been on just about every possible form of media. Including a video game in 1984. http://en.wikipedia.org/wiki/The_Hitchhiker%27s_Guide_to_the_Galaxy_(disambiguation)
I don't know I had the page open but it's not showing up when you click the link for some reason??? if you really wanna see it go to google and do a search for "The Hitchhiker's Guide to the Galaxy game"
You can play an updated version of the game on the Beeb website: http://www.bbc.co.uk/radio4/hitchhikers/game.shtml Don't forget That Thing Your Aunt Gave You Which You Don't Know What It Is
I'll pick this up again sometime tomorrow - not necessarily the same time - I want to give various timezones a crack at playing. I'll edit the first line in the first post to point to any current round so you don't have to dig through the whole thread Feel free to talk about aliens - and towers defending against aliens - in the mean time.
Aw, come on - even my wife knows who these guys are... (and she is not a sci-fi fan: she has seen the movie, and I've read parts of the books to her) The Hitchhikers Guide to the Galaxy has been a radio show, TV show, records, computer game, several books, comic books, CDs and a movie. You can play it on your iPod Touch / iPhone using Frotz or online HERE. Great contest! I pretty much spent lunch playing this game, best TD I've played yet (not that I've played that many...)