Printable Hard Sudoku

Set z6wbp4. 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
6 5
2 4 9 3 6
5 7 4 9
4
8 3 5 2
7
9 4 1 3 5 8
4 6 2
7 6 8
Hard #2
7 1 2
1 9 3 5
8
7 3 6
6 3 9 4
1 6 9
8 4 7 1
5 3 6 9
8 5 7
Hard #3
4 5 7
2 6 4
3 1 2
1 5 3 8
3 6 4
8 4 9 5
1 8
7 4 3
7 8 6 9
Hard #4
5 2 3
8 7 1
4 2
8 6 1
1 9 7 2 3
2 5
6 9
1 6 8
3 7 2 5 9 4
Hard #5
6 9 4 2
1 9
9 4 5 3
1 9 4 2 5
3 2
8 5 6
8 6 5 7
5
4 2 9 6
Hard #6
9 8 4 6 3
1 4 7 5
5 1 9
6 2 5
9 1
1 7 2 3 4
4 6 3
4
3 8 1
Hard #7
7 4 6
6 5 1 9 7
1 5 4 2
1 9 5 3
4 6
2 1 3 6
8 6 4 5
9
9 2
Hard #8
7 3 4
7 4 8 9
1 9
1 2
2 7 1
8 3 2 4 7
5 9 6 8 3
3 8 2 4
9

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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