Since generalized Sudoku is NP-complete, it should be possible to rewrite the Certicom or rsa challenges to "solve this sudoku to win a hundred thousand dollars."
Takayuki YATO,
Takahiro SETA,
Complexity and Completeness of Finding Another
Solution and Its Application to Puzzles
16x16 hypercube (4D cube) with numbers written in corner-shaded binary is elegant. Consider hints of just some of the bits of a number.
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