Giant 16x16 sudoku: every row, column and 4x4 box holds the numbers 1 to 16 or, in the hex set, 0 to 9 and A to F. Each grid starts with 112 to 124 squares filled in and needs no guessing. Four puzzles per set, one per page, with answer keys; the number set also comes in color.

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Free for home, classroom and work use. License information