Printable Hard Sudoku

Set 1ro3sk8. 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 9
3 6 5 9 4
5 4 3 2
7 9 5 3
4 7
8 3 2 5
2 7
1 3 5 8
7 6
Hard #2
2 6
8 1 9 5 4
9 7 1 8
9 7 3 5 2
3 6 8 5 7
7 6
6 1 3
4 3 9
Hard #3
5 8 2
4 6 9
7 1
1 4 7 5 6
9 5 8
5 7 6
1 7 6
2 7 9 3 5
9 2
Hard #4
4 3 1
7 6 9 3
9 2
7 1 4 2 9
8 5
3 9 6 4
1 3
3 7 4 1 8
5 2
Hard #5
1 7 8
3 4 1
4 9 8
6 8 7 2
8 1 9
2 7 8 6
9 3 6
9 7 4
3 4 6
Hard #6
4 3
3 7
5 2 8 7
3 9 6 5
8 5 7 1
6 2
3 1 2 4 6
4
9 8 6 1 3
Hard #7
9 6 4
8 4 3 6
7 5
2 6
8 7 1
1 8 3 9
3 7
4 7 8 3
9 8 2 7 1
Hard #8
7 5 2 6
3 2 7 8
6 8 1
1 7 5 3 2
4 5
6 9 3 7 4
5 1
9
8 7 3

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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