Printable Hard Sudoku

Set 1809dbp. 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 6
5 2 8 7
3 4
3 9
1 2 7 3
7 2 6 1 8 5
2 3 1 9
1 7
6 9 2
Hard #2
7 1 4
4 6 5
1 5 9 4 3
2 4 3 8
5 2
4 1 9 6 5
6 1 4
2 1
3 5
Hard #3
5 7 8 4
3 8 5
9
2 7
1 6 8
9 6 1 2
3 9 5 6
2 1 9 5
7 6 3 1
Hard #4
4
5 3 8 2 4 9
9 7 2 6 8
1 8 6
3 5 1
6 7 4
7 8 1 6
1 2 4 7
Hard #5
5 7 6
2 6 8 4
3 6 8
7 3 4 6
4 5 1
9 5
1
4 5 8
7 5 6 3 4 1
Hard #6
3 1 6
1 5 3 8
9 6 3
1 8 9 2
6 9
7 5 8
4 9 2 5
7 3 8 6
4 2
Hard #7
1 4
8 2 6 5 1 9
9 5 6 8 7
3
4 8 9 3
1 2 6
8 6 4 1
1
2 9 7
Hard #8
1 8 5 3
3 4 9 1
6 1 5 7
9 4 5
7 8 2
6 3 7
4 5 6
1 6 8
3 7

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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