Extreme Sudoku: 100 Difficult Level 4 Puzzles
平装
US$7.95
Rich Goodwin loves a good puzzle, and he's made it his mission to share that with others. His favorites are sudoku and word search, but he's also a sucker for a good crossword or cryptogram. Follow him on Twitter @richgoodwin12 Facebook @AuthorRichGoodwin or email goodwin.rich (at) mail (dot) com
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