: Offers thousands of free hexadecimal Sudoku puzzles organized into 100 printable booklets per volume. Puzzles are available in both hexadecimal (0–F) and decimal (1–16) formats.
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Many websites offer printable puzzles ranging from "easy" (for beginners getting used to the large grid) to "evil" or "expert". Where to Find High-Quality 16x16 Puzzles to Print : Offers thousands of free hexadecimal Sudoku puzzles