Printable Hard Sudoku

Set oo6wuj. 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
6 3 9 8
4 8 9 1
3 1 9 5
5 9 4 3
2 4
4 2 5 3
7 3
1 6 2
Hard #2
6 7 8 3 1
1 7 6
9 5 4
8 9 3
3 6 8
9 6 4 5
4 1 7
2 4
6 1 3
Hard #3
8 1 6 3
2 5
6 2
9 2 1 3 6
5 9
8 4 9 1
7 3 5 1
5 4 9 1
9 6
Hard #4
9 7 6
5 3 2
2 6 9 1
4 9
2 1
3 4 9 7
1 8 3
6 9 8 7
2 9 3 5
Hard #5
5 8 6
3 6 2
2 1 8 7 4
2 7
1 8 5 9
3 4 5
6 4 8
7 9 3 8 6
4
Hard #6
3 7 8 5 4
6 8 3 9
4
6 3 9 1
9 4 6 8
2 5
7
8 4 2 9
6 1 9 5
Hard #7
8 6 5 1
9 7 8
4 3 2
3 9 2 4
3 7
2 6
6 7 5 8
5 7 6 3
1 8 4
Hard #8
2 7 4 1
3 4
4 6 5
8 1 3 9
2 8 3 4 5
9 7 5 8 6
3
8 7
1 6 4

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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