Printable Hard Sudoku

Set 17dxc88. 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
5 3
6 1
2 6 8 5 9 1
4 2
8 1 4 7
6 2
6 7 4
1 2 9 3
2 4 3 6
Hard #2
6 8 9 7
9 1 3 6
4 8 1
1 5 2
6 7 4 2
9 1 5 3
4 9 3
7 1
8 2
Hard #3
5 7
7 2 8
9 3 7
3 2 5 1
8 2 4 9
5 1 3 2
1 8 6
2 8 9 5
4 2
Hard #4
3 8 4
7 8 3 9
6 9 2
8 9 5
1 6 3
9 8 4
5 6
2 1
1 7 3 2 8 4
Hard #5
1 9 4 3
6
3 8
8 9 6 1 5
8 2 7
5 7 3 2
3 5 8
7 1 4 2
5 7 9
Hard #6
3 1 8 6
8
6 3 2
5 9 3 4
8 7
9 6 5 1
6 1 9
1 5 3 6
9 4 6 7
Hard #7
9 8 3
2 5 9
8 3
2 5
1 3 9
7 9 6 2 4
8 7 2
6 5 4 8
1 5 3 8
Hard #8
2 7
8 9 6 2 5 4
5 4 2
1 4 5 9 8 3
7
2 3 7 9
1 8 9 4
8 9 5

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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