Printable Hard Sudoku

Set wckbp6. 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
2 4 6 7
1 9 4 5 3
5 9 6 1
5 2 7
5 1 3
4 5
6 1 3
8 1
4 7 8
Hard #2
3 7
1 5
6 9 1
7 3
3 4 2 7 5
2 3 9
6 9
9 4 7 8 3
7 3 6 8 4
Hard #3
9 1 4 8
7 6 3 9
3 8 6
9 7 2
2
5 8 9
8 5
2 6 8 9 3
5 2 6 7
Hard #4
6 5 7 4 1
9 7 5 2
7 6
4 5
9 5 2
5 2 4 7
6 3
1 8 5
4 1 2 6
Hard #5
4 2 8
3
8 1 5 4 2
2 9 1
5 8 6 3
4 8 2 5
7 4 5 6
1 8 9
3 4
Hard #6
6 5 2 8
4
4 7 2
5 7 8 9 1
4 7 1 9
1 5 3
9 5
7 3
2 6 3 9 1
Hard #7
4 7 1 2
1 9 6
9 7 8
7 8
3 5 8 4 2 7
1 7 2 4
3 9 2
6 9 7
2
Hard #8
5 6 2
2 3 4 6
9 6 8 5
7
4 6 8
7 2 3 4
3 8 7
2 8 4 6 5
9 8

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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