Encyclopedia Frobozzica

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Origins and Content of the Encyclopedia

Nino Ruffini, compiler of the Encyclopedia Frobozzica (966 GUE edition), merged the encyclopedia entries from Sorcerer and Zork Zero with text from some of the other Infocom games' box contents and a few of his own entries. The original version of the Encyclopedia was circulated around Delphi and the rest of the Internet until Activision came across it and asked Ruffini for permission to use it in Return to Zork so they wouldn't have to recompile everything themselves.

This explains why the Encyclopedia does not contain information from Return to Zork itself, nor information from the other later Zork games (Zork: Nemesis, Zork Grand Inquisitor, and Zork: The Undiscovered Underground).