Printable Hard Sudoku

Set imn24j. 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 2 5 8
5 6
4 9 7
8 5 4
9 7
1 9 5 6 3
5 2 4
3 2 5
6 7 3 9
Hard #2
2 4 8 7 9
5 1 2 8
2 6 5
9 4
5 7
6 7
5 6 1
4 1 6 9 8
3 2 4
Hard #3
3 9 2 1 5
5 8
1 3 7
4 9 6
8 5 7 4 1
1
5 1 4 2 9
1 7
4 6 8
Hard #4
2 9 6
5 4 3 1
9 3 4 1 5
9
6 1 2
2 8 4 6
7 3 5 4
7 9
4 8 1
Hard #5
9 4 1 6 2
5 7 3 8
7 4
8 7
5 2 1
2 9 1 6
6 3 4
3 1
5 7 1 6
Hard #6
5 6 1
2 8 1 4 7
3 5
1 9 3 2
6 4 9
4 7 2
6 9 7 2
8
4 1 2 9
Hard #7
8 3 1
6 9 8 7
6 2
7 8 6 4
7 4
2 5 9
5 3 6
3 2 7 4 5
4 7 2
Hard #8
4 9 8
5 1 6
1 6 7
7 6 2
3 2 5 9
1 7 3 8
2 7 3 4 1
7 6 9
1

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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