Printable Hard Sudoku

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

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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