Printable Hard Sudoku

Set 1js9o2. 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 9 2
4 5 3
2 5 6 9 8
4 7
8 5 1
3 4 6 2
6 2 7 5
3
2 4 9 6
Hard #2
6 3 7 8
5 4 9 7 2
4 6
4 1 9 3 6
3 7 8 4
7 2 6 3
9 3
9 1 2
Hard #3
7 4 1 5 3
4 7
5 6 4
1 6 2 8 7
7 9 8
2 1
8 6
8 3 1
3 5 1 4
Hard #4
8 4 2
4 1 8
3 1 9 2 7 4
8 6
5 9
7 4 5
3 1 7 4
7 9 6
4 9 6
Hard #5
7 3 6
2 9 5
3 1 5 4
6 9 2 8
8 6
3 1 9 5
8 7 3 6
9 3 6
4 7
Hard #6
8 5
9 4 1
9 7
9 3 7
2 7 1
1 8 4
2 8 4 7 3
4 2 1 6
8 3 6 2
Hard #7
5 7 2
4 7 1 8
6 5 9
6 2 1
5 1 8 6
6 7 3
4 9 1
2 4 3
7 8 1
Hard #8
2 6 1 9
1 9 5 6
5 4 8 3
1 2
8 9 2 6
5 2 6 4 7
4 3 9
6 4
2

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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