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Hard printable sudoku (free PDF)
Six hard sudoku puzzles for players who know the basic techniques. Our solving engine has analysed every puzzle. Each has exactly one solution and can be solved without guessing. They require at least one advanced technique, such as X-Wing or Simple Coloring. The answers are on separate pages at the back.
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3 pages · 6 sudokus · incl. answer key
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Sudoku
1 · Hard
8
3
9
5
4
1
7
9
5
9
2
8
3
4
8
2
5
8
9
6
8
7
7
3
6
1
9
2 · Hard
4
5
2
8
1
3
2
1
6
9
2
8
7
5
9
2
4
1
3
4
2
7
4
9
5
6
Provided by sudokuen.comPage 1 of 3
Sudoku
3 · Hard
9
1
6
7
3
7
5
7
9
3
5
2
4
5
6
3
1
4
8
7
1
6
9
7
2
4 · Hard
3
9
1
2
7
2
9
1
7
1
5
8
9
4
8
7
4
6
9
3
3
1
5
8
4
Provided by sudokuen.comPage 2 of 3
Sudoku
5 · Hard
1
7
5
2
4
6
4
7
2
3
2
8
8
9
9
3
6
4
6
9
4
3
5
7
8
6 · Hard
3
2
9
6
3
5
8
1
4
1
2
9
5
9
2
7
4
7
6
7
9
2
3
Provided by sudokuen.comPage 3 of 3
Answer key
1 · Hard
8
6
3
1
9
5
7
4
2
2
4
1
7
8
6
9
3
5
7
5
9
3
4
2
1
8
6
6
1
7
5
3
4
2
8
9
4
9
8
6
1
2
3
5
7
5
2
3
8
9
7
6
1
4
9
2
8
4
7
1
3
5
6
5
7
3
8
6
9
1
2
4
4
6
1
2
3
5
9
7
8
2 · Hard
7
3
8
4
1
6
9
5
2
4
9
1
7
2
5
6
8
3
5
6
2
9
8
3
1
7
4
3
8
7
5
4
9
2
6
1
5
6
9
2
1
7
8
3
4
4
2
1
6
3
8
7
9
5
8
9
3
6
7
5
1
2
4
1
5
6
3
4
2
9
7
8
2
4
7
8
1
9
3
5
6
Provided by sudokuen.com
Answer key
3 · Hard
2
9
5
4
1
6
7
3
8
3
7
1
2
5
8
4
6
9
8
6
4
7
3
9
5
2
1
3
6
1
8
2
4
5
7
9
8
9
7
1
3
5
6
2
4
4
5
2
6
9
7
1
8
3
1
4
2
9
5
3
6
8
7
5
8
3
7
1
6
9
4
2
9
7
6
2
4
8
3
1
5
4 · Hard
8
9
2
7
5
6
4
1
3
4
3
6
9
8
1
5
2
7
7
1
5
4
3
2
8
9
6
3
4
9
1
2
7
6
8
5
1
7
5
8
6
9
2
4
3
2
6
8
5
4
3
1
7
9
2
7
4
5
6
8
9
3
1
6
9
8
3
1
4
7
5
2
3
5
1
9
2
7
6
8
4
Provided by sudokuen.com
Answer key
5 · Hard
9
2
6
8
3
1
7
4
5
7
1
8
5
2
4
3
9
6
4
3
5
7
9
6
8
1
2
4
5
3
6
9
2
1
7
8
8
6
1
4
3
7
9
5
2
2
7
9
1
5
8
3
6
4
3
1
4
2
6
7
5
8
9
6
8
9
1
4
5
2
7
3
5
2
7
9
8
3
6
4
1
6 · Hard
3
2
6
1
8
7
5
9
4
9
4
7
6
3
5
8
2
1
8
1
5
9
4
2
6
7
3
6
4
1
8
3
2
9
7
5
5
9
3
7
1
6
4
8
2
7
2
8
5
9
4
3
6
1
2
1
9
7
6
3
4
5
8
3
6
8
2
5
4
1
7
9
4
5
7
1
8
9
2
3
6
Provided by sudokuen.com
How to create printable Sudoku puzzles
1. Choose your setup
Choose the difficulty, how many Sudoku puzzles you want, and how many puzzles to place on each A4 page.
2. Decide on the answer key
Do you want the solution on the back of each sheet, collected on a separate sheet at the end, or no answer key at all? It's up to you.
3. Download and print
Press “Download PDF”, open the file and print on regular A4 paper. Your booklet is then ready.
Tips for a great printout
- Choose “Fit to page” in the print dialog so the Sudoku puzzle fills the whole sheet.
- Print in black and white. Sudoku does not need colour, so you can save colour ink.
- One or two Sudoku puzzles per page provide the largest cells and the most space for writing numbers.
- Are several people solving at once? Print multiple copies of the same PDF.