Printable Hard Sudoku

Set y4bima. 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
2 5 1
5 4 6 9
2
6 7 5 9 1 4 8
5 1 2 6
7
3
2 4
8 5 7 6 3 9
Hard #2
2 9
8 6 5 4
9 6 7
5 8 3 6
9 6 1 7
4 5
2 5 8
6 8 5 7
9 1 2
Hard #3
2 5 1
5 2 1 9
5 6 7
3 9 5 8 4
8 7 6 3
1 9
3 9 6 4
5 2
9 2
Hard #4
2
6 2 7 8 1 9 3
1 9 8 2
9 8 6
4 2
6 5 4 2
3 1 8
9
9 2 3 4
Hard #5
3 6 7 9
1 2
4 7 6
8 6 1 9
2 3 5 6
1
8 3 2
9 8 4
6 8 2 9 5
Hard #6
4 5 8 6 7
9 3 5
9 8
9 7 6
6 7 3 9
1 5
2 6 1
4 6
7 3 1 2 4
Hard #7
7 1
1 5 4
6 2 7 5
2 6 3
5 8 4
7 9 2 5
2 1 6 3 8
4 3 8 9 7
Hard #8
7 6
2 8 7 4
1
6 5 4
5 9 3 8 2
3 4 2 7
8 9
8 2 4 1
2 9 5 1

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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