Printable Hard Sudoku

Set 1rrq72f. 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
5 3 1 8
8 1 7 6
7 6 5 2 1
1 9 8
2
8 3 5 9
7 2 4
2 4 7 8 6
Hard #2
2 4 9
3
9 1 6 5 2
8 4 2
4 1 7 9
9 6 1
5
2 1 6
4 8 2 3 5 1
Hard #3
6 1 9
2 1 3 5 8
3 6 8 7 1
3 2 5
2
3 4 7
5 7 6 3
6 8 7
4 8
Hard #4
5
7 9 2 3
8 6 5
2 6 1 9
9 4 1
3 6 9 4
9 3 1 5
4 3
5 3 8 2
Hard #5
7 6 4
9 4
5 7
6 3 2 8 5
1 9 2
2 1 5 6 9
1 3 6
7 6 2
8 3 1
Hard #6
3 2 4 6
6 8 1
7 5 3 1
4 2 9 7
2 3 7 9 6
7 5
9 2 8
2 5 6
1
Hard #7
8 2 1 3 5
3 7
6 3 7 8 1
4 6 2
1 9 7 5
7 6
7 2
4 9
3 9 5 4
Hard #8
1 7 8 2
3 4
9 5 3 7
9 2 4 1
5 8 3
3
7 8 2
4 5 9 3
7 6 4 5

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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