Printable Hard Sudoku

Set 1otl5qh. 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 1
6 4 3 7
2 6 7
3 5 6 8 9
7 9 6 3 8 4
2 5
2 5 4
9 5
9 1
Hard #2
3 2 9 1
8 6 4 2
1 2 5 7
4 8
1 5 2
9 8 1 5
4
1 7 4 2
3 8 9
Hard #3
8 4 7 6
1 2
4 5
5 1 7 2
4 2 5 7
6 5 9
5 6 3 8
2 3 6
8 9 2
Hard #4
5 2 3
8 4
2 6 7
1 7 3 4 6 8
9 6 5
1 7 4
1 3 9 7
2 7 9 8
7
Hard #5
9 2 3 7
3 8 9 7 5
6 3
4 1 9 6
2 1 7
8 4 5
1 7
5 9 4 8
2 5
Hard #6
3 1 5 2
2 8
7 3
8 1 6 5
3 1
1 3 6 9 7
1 3 5 6 4
1
2 5 7 9
Hard #7
1 8 6 5
6 4
2 7 6
8 5 3
2 1 5 6
9 4 2 3
5 8 1
4 7 3 9
8 7
Hard #8
2 9
8 3 7 6
6 4 3
2 9 5
8 5 1 7 2
4 8 7
2 1 3
6 9 5
1 2 6

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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