Printable Hard Sudoku

Set sre1hw. 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
1 6 7 3 8 4
4 3 6
2 9
7 2
5 3 8
4 8 5 3 6
7 5
3 2 1 9
5 6
Hard #2
4 7 5 3 2 8
8 6 9
9 1 6 5
5 9 1 4 7
9 5 2
6 4 8
3 6 5 2
7
Hard #3
3 8
8 6 5 4 1
9 6
7 4 6
2 5 8 1 7 3
1 6
6 2 3
4 1 7
5 4 8
Hard #4
1
6 4 2 8
7 6 8 5 2
3 7 5 1
5 1 4
6 7 9 8
1 4 2
1 3
5 6 9
Hard #5
9 6 3 2
8 3 6
9 2
4 8 2
4 7
3 2
6 1 8 7 9
9 7 4
2 9 4 5 6
Hard #6
2 8 7 6 4
9 8 1 6
8 7
5 3 1
3 4 1 7 6
4 6
9 4 3 2
8 1 9 5
Hard #7
5 9 4 2
4 8 7
1 2 7
9 5 3
3 2
1 8 5 7 2
7 3 5 9
2 8
3 6 8
Hard #8
8 7 2
3 2 9
1 7 5 4 3
1 7 3
3 6 7 2 4
9 5
2
4 8 3 1 6
1 8

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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