Printable Hard Sudoku

Set 1m0241t. 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 8 2
7 9 3 5
2 7 9
6 1 9
7 4 2 8
3
2 8 9 4
3 7
2 5 6 1
Hard #2
8 3 4
2
4 1 8
5 7 2 1 8 3
8 3
1 4 6
2 8 7 5
4 3 7 1 2
5 6
Hard #3
1 5 8 7 9
2 5 6
6 3
8 6 9
9 6 7
2 6 8
5 9
9 7 4 6 3
1 3 8
Hard #4
7 9 3 4
2 9 7
3 6 5
5 2
7 2 1 9 4
6 8
1 4 2
5 8 3 7
2 8 6
Hard #5
1 4 9
4 6 3 2
3 5 1 8 4 7
3 4 9
9 4 1
2
6 5 7
5 7 3
1 8 4
Hard #6
2 1
8 7
7 8 5 2
7 2 9 5
4 1 6
5 3 6 9
4 5 9
6 2 9 7 5 4
3
Hard #7
1 3
6 2 1
2 4 5 6 9
6 3 5 2
5 7 4 1
9 4 5 7
7 9 3 8
8 4 1
Hard #8
8 4 1 2
9 8
7 2 5
6 3 7 4 1 2
9 2 5 7
4 7 6
5 2 9
4
7 4 1

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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