Printable Hard Sudoku

Set 1r26ox9. 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 8 1
7 6 3
5 4 1
9 2 3
1 4
3 6 9 7 1
2 5
2 9 8 4
7 1 5 6
Hard #2
6 7 8
9 4 3
7 9 2
1 3 7
2 7 4 6 5 3
9 5 2
9 1 5
3
6 4 5 2
Hard #3
3 4 6 2 7 9
4 6
9 8 3
1 2
3 8 7 2
9 7 1
1 3 8 4
3 5 9
2 1
Hard #4
8 6
9 3 4
7
8 3 4 9
2 3 9 5 8 1 6
5 6 3
4
9 7 1
5 4 2 8 9
Hard #5
6 7 4
2 8
9 8 4 7 1
5 1 9 2
3
9 3 4
8 3 7 9
1 4 6 2
5 6 7
Hard #6
6 4 9 8
8 6 5 4
4 1 2 5
7 3 9
9 5 6
3
2 5
2 3 8
5 7 8 4 3
Hard #7
2 1 5
7 1
1 8 3 2
5 1 6
5 4 9
4 6 3
5 2 7 6
8 9 5 2
6 9 7
Hard #8
1 8
3 9
2 1 7 4
4 3 6
7 6 8
3 2 8 5 7 4
8 4 3
7 8 5
1 3 2

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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