Printable Hard Sudoku

Set 160gdsp. 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
5 7 9 6
3 9 7
9 4 2
1 2 5
9 4
3 5 8 1 4
7 8 5
8 2 1
2 8 6
Hard #2
5 6
8 7 5
1 4 6 7 8
7 1 4 6 3
6 5 9
9 5
7 3 6 1
9 6 1 2
5
Hard #3
3 7 5
5 7 2
9
4 5 6 1
8 7 6
1 9 3 2
9 8 3 6 1
6 1 7
5 6 8
Hard #4
9 6 8 3
9 6 8
4 6 1 9
8
1 2 3
9 4 1
8 6 3 4 7
3 5 1 2
6 2
Hard #5
4 8 5
4 3
1 2
2 1 9 7
7 4 3
9 3 5
9 7 6 4
1 2 6 7 8
6 8 1
Hard #6
7 6 4 8 1
1 4
9 3 5
8 3
5 9 6 4
2 9 3
1 3 7 2 4
8
9 1 5 8
Hard #7
4 6 8
8 9 5 6
3 8 9 1
1 6
2 4
1 5 2 6
4 8 3 2
2 4 5
3 5 8
Hard #8
9 5 8 1
3 7
7 4 6
6 7 4 2
4 2
9 6 1 8
9 5
2 6 7 9
8 1 7 3

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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