Printable Hard Sudoku

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

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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