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When you focus on solving a puzzle, the problems of the world seem to slip away. It’s a meditative, Zen process—and these 272 elegant, intricate sudoku, designed to resemble mandalas, engage both the eye and the mind in new ways. Each page features four precisely arranged puzzles, with the numbers carefully selected to keep the sudoku solvable and still maintain their symmetry. Perfect for medium-level solvers, this attractive collection is sure to soothe your soul as it feeds your brain.
Frank Rubin is a retired IBM computer programmer who has done extensive work in the field of design automation. He has written many papers on the layout and wiring of computer chips and circuit boards, and related topics in graph theory and combinatorial mathematics. Rubin is also a cryptographer who holds major patents in the field of keyless cryptography. Beyond his professional activities, he is famous for his thousands of mathematical puzzles, as well as cryptograms, alphametics, SumSum, double sudoku, and papers on knight and bishop coverings in chess. He lives in Wappingers Falls, NY.