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What About All My Third Edition Books?
We know that our fans have a significant investment in the current edition of GURPS. One of our goals in the Fourth Edition design process was to make sure that your entire library would not become obsolete overnight.
While the new edition is different, it's still GURPS. Many Third Edition books will be good to go for Fourth Edition play with a minimum of conversion - and a conversion guide is available here. Most of the information in our typical worldbook or sourcebook - the thorough historical research, the detailed setting descriptions, the roleplaying advice for both players and referees - is usable with any other game system. That's still true now that the "other game system" we're talking about is GURPS Fourth Edition.
Of course, the very "crunchy" rulebooks, such as the old GURPS Basic Set itself, the two GURPS Compendium volumes, and GURPS Vehicles, are outdated. There's no way around that; that's the point of a new edition.
But most of the collection will still be completely useful. See this ludography for a more detailed list of Third Edition books that are easy to use with GURPS Fourth Edition - and still in print!
(С) sjgames.com