Printable Hard Sudoku

Set yguq2r. 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
1 4
1 7 5 2 6
6 5 8
1 2 3 9
6 3 8
5 1
7 5 9 6 8
2 6 9
4 2
Hard #2
2 3 5
5 2 9 8
8 1 4 2 6
1 9 7 4
7
6 2
9 4 8
2 8 5
5 3 6 1
Hard #3
7 2 8
8 4 6 1 9
5 7
6 3 9
1 5 2
5 3 4 6
1 5 4 6
2 7 3 4
7
Hard #4
2 7 8 9
1 2 5
3 4 8
9 2 4
1 7 2
4 5 8
7 1 5
8 3
9 5 2 1 7
Hard #5
8 2 3
5 6 9 7 3
1 7 4
2 8 3 1
1 5 2 7
4 9
5 9 2 4
5
7 1 8
Hard #6
1 4 2 8
5 7
7 3 6
2 6 4
3 4 1 9 7
9 5
7 8 4
2 3 9 6
4 9 1
Hard #7
3 4 2 8
5 8 9
7 9 3 4 2
3 4 7
2 8 3
4 6
9 5
5 2 7
1 4 9 8
Hard #8
2 4 7
2 9 7
5 9 7 8 6
1 5
4
1 7 5
8 1 7 4 9 6
6 3
1 7 6 2

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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