Printable Hard Sudoku

Set jiesx8. 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
5 2 1
6 2 1 9 5
3 8
2 5 7 6
6 3 4 1
1 5 6 3 2 9
2
7 3
Hard #2
5 7
1 3 5 9
2 3 1 8
1 9 7
5 1
9 7 4 3
4 8 1 2
8 4
2 6 3 5
Hard #3
4 7 8 2
8 2 1 6
7 6 3
3
9 8 5
1 7 8
6 8 7
7 2 1
2 1 3 9 6
Hard #4
6 9 3
4 7 3 1
8 3 5 1 2 4
7 9 2
7 4 8 6
3 7
7 3 4 9 6
8 9
Hard #5
5 1 3 8
2 6 3
9 4 8 6 1
2 8 9 4 5
1 7 6
3
3 1 4 6
6 2 3
9
Hard #6
1 2 4 6
4 1 5 7
3 6 1
6 9 7
4 2 5 3
2 8 7 5 9
8
5 7 3
7 1
Hard #7
1 3
9 2 8 4
4 5 3 7
2 9 3
4 3 7
7 5
9 6 8 5
5 8 2 1
6 4 8
Hard #8
7 1 4
4 7
8 4 6 5
7 6
6 4 3 2 9
8 5 7 6
2
1 8 3 5
6 8 7 1

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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