Printable Hard Sudoku

Set 1dt7shi. 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 7 1 3
8 2 7
5 2
4 1 8
2 7 9
1 5 9 2 7 4
3 4
2 7 8 6
8 6
Hard #2
4 7
8 9 6 2 5
9 5 3
2 3 7
8 9 1
3 5 6 9
3 4 1
3 2
5 6 1 4
Hard #3
9 7 6 4
8 7 2
6 5 3
8 9 3
1 6
2 4 1 5
4 2 6 1
5 3 1 2
5 4
Hard #4
7 3 1 9
2 9 4
8 9 5
5 7 2
4 3 5
2 6 4
3 6 2 7
1 5
7 6 4 8
Hard #5
1 9
9 8 2 6
6 8 4
7 3 8
1 5 3 7
7 1
9 3 5
2 9 4 1 8 3
8 7
Hard #6
2 4
3 8 4 9
4 8 1 7
1 8 9 6
2 9 6 8
7 2
9 6 8 2 4
3 2 1 6
Hard #7
7 3 4 8
5 7 8 1 6
7
2 9
8 9 3 2 1
5 4
6 5 9
6 1 3 4
4 9 3
Hard #8
8 5 7 9
4 6 8
3 5
9 7 3 4
2 9 6 3
8 1 7 3
9 2 5
7 4 6 8 2

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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