Authors: Puzzler Media, The Guardian, Nikoli Publishing
Related Series: The Times Ultimate Killer Su Doku, The Times Killer Su Doku, The Times Fiendish Su Doku, The Times Su Doku, The Times Difficult Su Doku
by multiple authors includes books Guardian Sudoku: Bk. 1 and The Guardian Book of Sudoku. See the complete The Guardian Su Doku series book list in order, box sets or omnibus editions, and companion titles.
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