Printable Hard Sudoku

Set 1y6donl. 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 3 7
3 5
3 1 8 5 2
6 2 3
7 9 4
2 1 6
5 4 7
4 9 1 8
2 5 7
Hard #2
1 6 3 2
6 3 7 5 8
4 6
7
8 3
6 9 2 7 1
5 8 4 6 2
3
2 3 7 8
Hard #3
5 7 3
9 8 5
7 2 5 1
5 2 8 1 4 9
8
6 4 1 3
5 1 3 4
7 2 9 5
Hard #4
7 4
7 1 6
4 6 3 9
3 2 4 5 8 7
3 9 6
8 6 3 4
5 2 4
5 8
9 6
Hard #5
3 2 1
2 6 5
9
4 2 5 9 1 3
8 5 3 7 2
3
3 1 9 7 6
5 9 7
6 1
Hard #6
8 4 3
6 2 8 5
1 7
9 2 7
4 2 3 8 9
5 6
2 4 3
5 4 1
1 8 6 2
Hard #7
9 7 4 8
5 3 6
1 4 3
1 9 5 7
4 7 5 2
4
9 4 1 6
5 7 2
8 9 5
Hard #8
4 2 9 7
9 2 5
9 6
3 6 8 1
4 9 1 7
1 6 3 8 4
4 9
7
7 1 6 3

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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