Printable Hard Sudoku

Set 1jngp2d. 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
3 8 5
9 7
4
4 1 3 2 9 7
1 7 3
9 2 4
3 4 6
9 6 5 1
9 5 4 6
Hard #2
3 9 4
4 6 7 5
8 5 4 3
8 3 2
1 4 7 8
6 7
2 1 8
7 5 9
5 8 2
Hard #3
4 3 7 8
2 8 6 3
9 1 8 6 2
9 4
2 8 3
1 9
5 9 8
2 5
3 1 2 5
Hard #4
6 9 1 5
9 7 3 4
8 4 6
5 3
7 9 2 3
2 8 4
3 6 8
2 6 7
4 5 3
Hard #5
7 3
7 3 6 9
1 9 5
2 8 3 9 4
4 3 6
5 7 1
2 4 3
5 6
3 5 8 4
Hard #6
3 9
1 5 7
3 7 8 4
1 4
5 9 2 3 8
9 3 6 4
7 4 8 6 5
2 1 9 3
Hard #7
5 9 4 2
7 3 1
6 8
9 6 3 2
8 1 5 9
2 5 8 4 6
7 6 5
4 9
4 1
Hard #8
5 8 7
4 8 9
1
6 5 2 1 9
1 2 4 3
5 3 7
7 6 8
8 5 6
2 3 4 1

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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