Printable Hard Sudoku

Set alk9h8. 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
2 1 4
3 7
6 2 7 9 3
7 1 3
9 8 3
6 2 9 4
1 9 8 5
4 1
7 9 1
Hard #2
2 7 8
3 7
9 4
4 6 9 1 7
1 5
3 5 8
6 7 2 4
2 7 3
9 4 1 5 8
Hard #3
8 4 2 1
3 4 5
2 6 3
1 2 4 8
8 3 6 7
2 9 1
1 4 8
3 6
7 8 5
Hard #4
4 5 6 9 7
1 2
1 5
9 5 7 4 6
3 1
6 9
8 7 1 3
5 2 6 4
8 5 2
Hard #5
5 2 7
5 7 9
6 9 3
2 3 4
9
1 8 2
7 3 5 1
3 4 9 6 8
1 2 9 3
Hard #6
9 8 1
7 1 9
5 3 4
5 7
1 2 6 5
8 2 4
5 9
2 7 5 3
4 1 2 5 8
Hard #7
9 1
2 8 9 5 7
7 4 2
7 8
1
5 2 4 1 6 3
2 8 9 1
1 5 3 4
4 6
Hard #8
6 3 7 4
9 1 7
1 2
6 7
3 5 8 4 6
4 2 1
6 3 5
5 3 6 9 7
2 1

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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