World's hardest Sudoku puzzle book for adults vol 2: A Challenging Sudoku book for Advanced Solvers a fun way to Challenge your Brain . Solutions incl (Paperback)
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Hard Sudoku Puzzles you said ? ... Vol 2 Look no more, You have just found the hardest Sudoku Ever, so hard even the pro's have hard time solving it. Grab your self a copy and challenge your brain now .