What makes this a Hard Sudoku puzzle?

This Hard Sudoku puzzle has 31 given numbers (typical range: 28-31). Advanced techniques like X-Wing, Swordfish, and coloring are usually required to solve it.

Can I print this Sudoku puzzle?

Yes! You can print this puzzle using your browser's print function or download it as a PDF for offline solving.

How many Sudoku puzzles are in this collection?

PuzzleDepot offers over 1,000 free Sudoku puzzles across 5 difficulty levels. This is puzzle #78 of 200 Hard puzzles.

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Puzzle #78

Hard Sudoku #78

Hard

31 given numbers

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❓ How to Play

Fill the 9×9 grid so each row, column, and 3×3 box contains digits 1-9 exactly once.

Click a cell, then click a number or press 1-9
Arrow keys to navigate
P for pencil mode
Delete to erase
Ctrl+Z/Y for undo/redo