That's where the puzzle element could come in: Some categories might be defined by their use of wordplay - palindromes, homophones, adding or dropping letters and words - rather than the literal meanings of the words on the cards.
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The Fifteen Puzzle, as New York Times crossword editor and puzzle guru Will Shortz has observed, was the first in the modern era to inspire crazes: the precursor to the crossword, the Rubik's Cube, and, most recently, Wordle.
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