Printable Hard Sudoku

Set yn4519. 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
5 8
5 9 4
4 1 3
9 8 4 7
7 2 5 4 6
4 6 9
3 1 9 7 4 6
3 6 4
Hard #2
3 7 1 4 5 6
8 9 1
2 3 8 7
8 5 7
4 8
9 1 2
6 2 3
6 4
2 7 8
Hard #3
8
5 1 4
2 7 5 6
3 8 2 7 4
7 1 6 2
1 7
7 1 5
3 4 2 5 9 6
9
Hard #4
8 1 4 2 6 9
5 9 3
7 8
2 1
7 3
9 3 4 8 7
1 2
6 8
7 2 6 8 5
Hard #5
4 3 5 6
1 7
2 9 5 3
1 5 3
8 2 4
9 2 7
3 8
8 3 6
6 4 5 3 1
Hard #6
4 9
7 9 6
4 9 5 2
8 3 9
1 2 6 8
3 5 1 2
4 2 3 7
9 1 5
8 2
Hard #7
1 3
2 5 4 7
7 8 9 2 1
5 8
8 1 9 4
4 6 5 7
1 5 3
1 4
4 9 2
Hard #8
2 8 3 4 1
3 1
7 6
8 7 5
9
5 9 1
9 2 8
3 4 2 8 9 7 6
7 6 4

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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