These puzzles are not dressed to the nines - that's because not one of these Sudoku puzzles contains the number nine as a given, so solvers must do some mining to discover where they belong. Pixel-y, nerdy, creative and challenging, 'Ninecraft Sudoku' features nearly 190 puzzles that get harder as you go along and includes some grids with givens that are in shapes seen in mining games.
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Philip Riley is a software developer and the author of numerous computer programs that analyze variants of Sudoku puzzles. Laura Taalman is a professor of mathematics at James Madison University, Harrisonburg, Virginia, and spent a year as mathematician-in-residence at New York's Museum of Mathematics.
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