Hexadoku: The 16×16 Sudoku Challenge

Conquer the Grid: Hexadoku 16x16 Sudoku Puzzles to Print

Are you ready to level up?

You’ve mastered the classic 9x9 grid. The 6x6 offerings feel like a warm-up. Now, it’s time to step into the big league: Hexadoku.

Also known as 16x16 Sudoku or "Super Sudoku," Hexadoku transforms the familiar logic game into an epic brain-teasing marathon. Instead of numbers 1–9, this beast uses the digits 0–9 and letters A–F (representing values 10–15). That’s 16 symbols in total—and 256 squares to fill.

Printable Sources

When looking for puzzles to print, look for keywords like "Super Sudoku," "Hexadoku," or "Sudoku 16x16."

• Sudoku-Puzzles.net: Offers clear PDF formats.
• Print-A-Sudoku: Allows you to toggle difficulty.
• Newspaper Archives: Many weekend newspaper crosswords sections include a Hexadoku which can be photocopied or printed from online archives.

4. Printing Guide: Paper vs. Digital

Because Hexadoku grids are dense, printing them requires specific formatting considerations.

Creating Your Own Hexadoku Booklet

Why print one puzzle when you can print a booklet? Here is a DIY guide:

1. Download 10 PDFs from the sources above.
2. Combine them using a free tool like "IlovePDF" or "Smallpdf."
3. Print in Booklet Mode: In your printer dialog, select "Booklet" and "Print on Both Sides." This will rearrange pages so that you can fold them into a 5.5 x 8.5 inch booklet.
4. Staple the spine with a long-reach stapler.
5. Attach a pencil with an elastic band.

You now have a custom Hexadoku book for your daily commute or vacation.

Recommended Format

• Paper Size: A4 or Letter is acceptable, but A3 (Tabloid) is highly recommended for easier writing.
• Orientation: Landscape mode usually provides a slightly larger grid cell size than portrait for standard paper.
• Cell Size: Ensure the printed cells are at least 8mm x 8mm. Anything smaller will make writing alphanumeric characters difficult.