Jim Bumgardner’s puzzle site is a cult classic. His Hexadoku puzzles are known for being "elegantly difficult." They often feature symmetrical patterns and a unique aesthetic. He provides a weekly PDF of five puzzles.
Don't scan the whole grid at once. Focus on one 4x4 box at a time. List the missing 16 symbols for that box. Then, look at the intersecting rows and columns to eliminate possibilities.
(Expert puzzle intentionally blank for custom clues — use advanced solving techniques.) hexadoku 16x16 sudoku puzzles to print
Row-by-row (use '.' for empty):
Cross-hatching (looking at a row and column to eliminate candidates) works, but you have to do it across 16 lines. Use a ruler or a piece of paper to track rows. Scan Row 1 and Row 2 together to see what symbols are missing from a vertical stack of boxes. Jim Bumgardner’s puzzle site is a cult classic
| Feature | Classic Sudoku | Hexadoku (16x16) | | :--- | :--- | :--- | | Grid Size | 9x9 | 16x16 | | Symbols | 1–9 | 0–9, A, B, C, D, E, F | | Regions | 3x3 boxes | 4x4 boxes | | Total Cells | 81 | 256 |
The rules remain the same, but the scale changes everything: Row-by-row (use '
Standard 9x9 Sudoku strategies (Singles, Hidden Pairs, X-Wing) still apply, but they look different on a 16x16 canvas. Here is your strategic upgrade.
Teachers and math tutors often use Hexadoku for gifted students. These PDFs tend to have larger grids and are optimized for classroom printing.