Printable Hard Sudoku

Set 1rr6j00. 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
9 5 3 1
8 7 5 6 3
9 4 5
4 7 6 3 9
3 6
3 2 5
7
2 9
2 9 7 4
Hard #2
1 3
3 5 8 2
8 5 6
1 5 4
1
4 6 5 9
8 9 2 6
3 9 2 4
5 1 9 7
Hard #3
7 8
1 4 5 7 9
5 1 6
5 4 9
8 3 7
9 2 1 6 3
1 4 2 8 3
1 7
2
Hard #4
6 7 9 2 8
4 3
4 7 6
9 5
2 5 7 8
8 1 4
8 1 9
2 6 1
6 9 8 1
Hard #5
1 8 5
3 7 6 9 4
9 2 6
9 3
4 7 9 6
5 7 8
7 4 6 2
3 7 5
3 7
Hard #6
5 4 6
8 9 1
7 1 3 2
8 2
9 6 2 7
4 2 3
2 5 1
6 1 9 4
4 5 6
Hard #7
4 1 2
5 9
4 8 6
3 6
9 6 5
1 8
3 1 7 6 8 4
1 8 2 7
7 9 5 1
Hard #8
2 3 6
7 5 4
4
3 7
1 7 6 8
8 2 6 3 1
9 6
4 7 3
6 3 8 5 2 4

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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