Printable Hard Sudoku

Set 4y7s37. 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 4
3 1 5 9
4 5 8
8
7 3 9 6 4
2 1 9
8
6 4 9 2 7
5 2 7 6
Hard #2
8 9 7 1
9 2
4 2 1 9 6
9 6 8 2
7 8 5 4 6
2 1
8 7 4 2
8 5 2
Hard #3
3 5 4
4 8 2 9
1 3
9 6 2
1 4 6 5
1 6
3 7 6 1
7 2 9
6 8 4 3
Hard #4
2 9 5 8 4
4 9 3
5 2 3
7 6
2 7 1
8 5 4
7
9 2 3
3 1 4 9 2 6
Hard #5
7 5
3 9 2
1 6 3 8
6 4 2 3 9 8
5 2 3
3 1 7 9
9 6 1 4
8 9
3
Hard #6
1 5 4 8 2
6 9 1 5
5 8 7 4 1
4 5 3
6 3
3 6 9
2 9
9 2 5 8 7
Hard #7
8 9 7 4 1
1 2 3
6 9 1 3
6 5
1 6
8 7 9
2 7 3 6 8
8
5 1 9 2
Hard #8
2 3 8
5 1 9
8
4 7 2
3 8 4 6
3 1 8
2 1 8 4 7
5 7 6
7 6 8 9

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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