Printable Hard Sudoku

Set tow6v5. 8 puzzles with an answer key, ready to print.

Hard puzzles start with about 29 givens and need real techniques: pointing pairs, naked pairs and hidden pairs. Paper is a great way to practice them, because you have to keep your own notes honest.

Each free PDF has 8 puzzles, four to a page on US Letter paper, plus an answer key with every solution. Every puzzle has exactly one solution. A new set appears here every day, or you can grab a different set any time.

Puzzles in this set

Hard #1
4 5 9
3 2 9
4 5 8 6
6 5 1 8 3
2 6
9 4 7 1
7 9 8 4
8 6 1 5
Hard #2
3 6
7 2 6
5 8 3 2
4 9 3
4 7 8 2
9 8
2 7 8 5 9
1 4 8
5 1 3
Hard #3
8 5
9 7 2
2 6 9 4 8
1 8 5
4 3 1 7
6 7 8 3
1 6 4 3
7 2
4 5
Hard #4
3 8 2
1
1 6 3
9 5 1
7 5 4 3
2 7 3 6
1 4 6 7
6 3 8 4
5 9 6
Hard #5
4 5 7
3
7 2 1 4 5
4 9 3 5 6
1 6 3 2 4
5 8
9 4 1
4
1 9 7 2
Hard #6
7 4 2 5
5 9
8 7 6 2
3 4 7 8
7 1 3
6 9 1
4 7 5
3 4 1
2 6 5
Hard #7
7 4 3
4 6 8 2
5 3 6
7 6 2
6 9 4 7 5
8 4 5
9 1
2 1 6
5 8 3
Hard #8
7 4 1 5
6 2 8
1 7
8
1 2 9 7
9 3 4 6 8 5
9 2 4
4 1
3 9 8 6

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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