Printable Hard Sudoku

Set 159b799. 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
6 7 5
8 3 4 9
6 3 2
2 1 8 9
3 6 2 4
8 6 1 5
5 8 2
2 6 4 1
Hard #2
9 4 5 7 8
1 8 9
7 3 4 2
3 9 4
7 9 1 5
4
2 7 8
5 2 6
3 1 2
Hard #3
3
5 7
9 1 8 5
8 9 3 1
5 2 9 7
6 9 8 3
1 4
6 7 2 4
5 7 8 6
Hard #4
9 8
2 9 4 7
8 3 7 5
5 4 7 1 8 3
4 6 5
5 9
9 6
3 2
8 6 4 7
Hard #5
2 7 8
4 3 6 8 7
8 3 1
6 8 4 7
3 6 9
5 8 7 6
3
2 4 1 5
2 4
Hard #6
5 6
7 3 2
8 4 5
8 2 5
2 6 4 7 1
1 3 9
5 1 9
8 3 6 4
9 7 6
Hard #7
6 2 7 8
6 9 1
1 9 2
7 5 3 6
1 3
3 2 7
1
5 4 7 3
7 9 3 6 1
Hard #8
9 1 5 7 2
2 8
3 5 4 8
4 1
5 2 4 6 9
9 7
6 1
6 3 5 7
8 4 6

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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