Printable Hard Sudoku

Set up1vkt. 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 4 3 1
9 7 5 4
4 9 2
7 4 2 1
3 5 9
5 7 8 3
3 9 4 7 5 6
1
Hard #2
4 8 7
9 1 6
3 5 6
6 1 5
8 6 2
9 4 8 2
5 3 8
6 7 8 9 1
2 3
Hard #3
7 9 8
5 2 7
9 6 2
7 4
9 4 6
3 1 8 4
2 8
8 1 7 6 2 9
5 4 3
Hard #4
5 4 8
8 4
6 7
3 1 5
9 7 5 4 3
4 2 6 9
1 9 8
4 6 2
8 9 2 1
Hard #5
1 7 2 3 9 6
5 9 6 7 8
4
2 3 5 4
4 8 9
9 1 2 4
8 9 3 6
1
5
Hard #6
7 4 6 8 5
1 4
1 6
8 4
4 3 2 9
5 3 2 9
1 7 8 6
2 9 6 5
2 8
Hard #7
1 4
2 6 8
3 6 7 9 2
1 6
9 5 6 2
1 3 4 8 9
9 6
8 4 5
4 9 7
Hard #8
1 2 7 9 4
4 2
6 9 1 7
8 6
7 2 3
5 8 6
9 7
8 4 9
3 6 5 8 1

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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