Printable Hard Sudoku

Set 128v17w. 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 9 3
4 6 5
2 4
5 1
9 1 7 8
7 8 9 4
9 8 5 3
5 9
4 3 7 1 8
Hard #2
3 2 9 8 4
5
8 3
9 6 5
5 2 6 8
3 1 8 7 9
7 9 8 2 4
6 2
8 9
Hard #3
9 6 7
2 3 6 8
6 1 9 5 4
7 4
4 9 6 7
1 2 9 8 6
5 9
8
6 8 1
Hard #4
8 1 5
3 7 6 2 8
4 3
7 3 1 2
8 4
4 9
2 7 3 9
7 9 6 5
1 4 6
Hard #5
5 3
4 9 7
3 5 2 8
3
1 5 4 6 2 8
8 9 1
5 1 4 6
9 8 4
7 6 5
Hard #6
2 6 4 1 9 8
6 1 5
9 8 6 2
5
1 9 6
3 1 4
8 1 5 3 9 6
7 8
9
Hard #7
5 7 2 9 6
1 5 9
2 6
3 2 5
7 1 8 4 2
1 8 7 5
6 7
4 8
8 3 7
Hard #8
8 4
7 6 8 5
3 5 1 6
1 6 9 3
2 8 7 4
4
9 3 6 1 2
2 7 5
4 7

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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