Printable Hard Sudoku

Set 1j8d8. 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
3 4 1 9 8
7 3
6 3 2
1 8
8 6 7 9 4
6 1
5 6
3 2 5 8
1 2 4 9
Hard #2
9 4 6 8
5 2
3 6 7
8 4 1 3 6
1 5 9
4 1 5 2
2 5 3
8
7 4 5 9
Hard #3
9 7 8 6
6 2 3 9 7
2 9 5
1 2 8
1 4
6 7
3 1 4 2
1 5 7
3 9 2
Hard #4
9 7 2
4 1 3
2 6 4
8 4 7
5 7 8 9 1
6
3 2 7
6 9 2
2 9 1 8 4
Hard #5
8 6 7 3 4
2 1 9
3 6 5
4
2 4 6 8 7
5 3
4 5 8 7 2
9 4 7 1
5
Hard #6
6 2 7
6 4 2
8 7
7 8
9 1 8
9 7 2 3 1
2 5
3 1 5 4 9
7 9 1 3
Hard #7
2
4 9 7 5
8 4 9 1
7 1 5 4
1 6 3
8 7 5 1
4
6 7 2 5
3 5 2 8
Hard #8
7
4 3 6 7
3 1 8 2
4 2 6 8 5
8 1 7
9 3 4 7 8
5 9 4
8 6 3 5

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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