Printable Hard Sudoku

Set i0q9kp. 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
8 1 4 3 2
4 9 8 6
3 7 1
5
6 7 2 8 3
3
7 2 5
8 4 6 5 1
8 3
Hard #2
7 4 9
6 1 8
9 7 5
4 3
7 5 8 6
3 9 6
5 6 1
9 1 6 7 3
1 2 3
Hard #3
9 7 8
1 3 9
6 5 1
2 8 9 1
1 7
1 2 6
1 6 5
5 8 2 1
8 9 3 5
Hard #4
4 7 1 8 6
4
9 2
8 7 3 5
5 4 9 6 1
9 1
2 4 1 7
3
1 9 5 6 4
Hard #5
6 3 9 1
1 4 8
7 4 8
9 7 6
5 1 7
2
3 2 4 9
2 6 7 3 1
4 5 3
Hard #6
5 7
1 2
4 3 1 7 9 5
9 6 4
5 7 1 9 2
8 2
7 3 4 6
1 9 6 3
2
Hard #7
8 2
3 5 6 7
6 4 1 8 3
3 1 2
9 4 1 8
1 4
5 7 9
4 5 8
4 7 6
Hard #8
2
3 4
7 9 6 2 5
8
5 1 8 3 4
5 7 9
2 8 6
4 7 1 5 2
1 2 8 9

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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