Printable Hard Sudoku

Set 1da10ao. 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
4 9 7 2
3 2 5 1
5 6
7 9 1
8 3 2 6
5 4 3
4 6 5 2 9
9 8
3 1
Hard #2
2 9 7 4
1 6 3 5 7
8 9 6 1
9 6
3
8 3 1 5 2 7
8
6 5 2
7 4 5
Hard #3
3 5 6 7
1 3 6
7 8 9 3
9 7
5 2 3
2 3 4 8 9
2 6 4 8
8 5
4 1
Hard #4
9 3 8 5
2 8 4 1
5 6 7 3
5 9
2
9 1 3 7 6
6
8 6 9 1
7 2 9 4
Hard #5
7 5 3 1
1 7 4
3 8 7 5
4 1 3
9 6
2 9
8 6 1 2
7 8 1
4 1 5 7
Hard #6
3 4 2
7 4
5 8 9 2 7
3 6 4
7 4 6 9
1 3 5 2
3 4 2
6 4
9 5 1
Hard #7
9 3 7 5
2
8 6
5 8
3 6 7 1
1 5 2 9
1 5 3
9 1 3 5 6
7 3 9 8
Hard #8
7 3 6 8
3 2 4
6 4 1
1 6
3 9 7
8 9 4
4 7 5 2
1 2 5 8
6 2 9

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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