Printable Hard Sudoku

Set r901t1. 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
7 2 9
9 4 8 7 1
2 1 3
8 9 3
7 9 6 3
1 4
3 6
1 5 7 2
5 8 4
Hard #2
2 6
7
4 6 5 9 1
2 8 5
5 2 1
6 9 3 4
2 6 3
7 1 9
5 3 8 7 2
Hard #3
4 3 8 7
6 4
5 8 1 6 2
3 7 8
9 5 1
7 9
4 3 8
2 6 4
7 6 5 4
Hard #4
2 7 1 8
4 8 3
9 3 2
5 3 4 9 7
1 7 8
7 5
3 1 5 7
8 4 6
5 6
Hard #5
4
9 1 3 7 5
1 7 5 8
3 8 9 4 6 2
1 6
3 1 4
2 5
8 4 3
5 9 4
Hard #6
8 6 2
1 3
1 8 3
3 4 8 5 2
8 2 9
7 4 6
9 7 4 2 1
8
6 5 3 7
Hard #7
5 3 4 7
7 2 9 4
8 5
3 2 7 6
7 6
1 3
6 3 2 1 4
2 5
4 5 3 1
Hard #8
6 8 5 7
4 2
3 7 1
6 3 1
2 6 8
7 1 6 5 4
4 8 1
9
1 8 5 9 7

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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