What is classic sudoku?
A 9 x 9 grid (or 4 x 4, 6 x 6, 16 x 16) where every row, every column and every box holds each number once. The givens are the clues.
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A 9 x 9 grid (or 4 x 4, 6 x 6, 16 x 16) where every row, every column and every box holds each number once. The givens are the clues.