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About InvisiClues : InvisiClues were sold by Infocom to help players solve puzzles Zork Users Group began a pay-per-hint telephone system . InvisiClues replaced this system and was revolutionary . Players could often buy a hint book at the same time as the game itself . The InvisiClues for Zork I contained the answers . A series of "empty" boxes located below or following the text contained answers . The contents of each box could be revealed by using a highlighter-like marker .