Printable Hard Sudoku

Set 152giuy. 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 5 6
1 4
7 4 6 2
3 2
8 2 4 5
4 9 8 7 1
7 1 8
2 3 7
2 9 1
Hard #2
2 6 7 1
7 9
9 6 1 8
5 8 1 2
8 5 3
9 6 8 4
2 4
7 8 5
4 9 6
Hard #3
5 2 4
9 3 2 6 5
3 1 6
2 5 4 3
4 9 7
5 8 9
6 7
9 3 8 1
8 1
Hard #4
2 1 8
4 9 5 7
7 6 4
4 9 6
9 8 3 2
6 1 2
7 6 5
6 5 8 2
4 8
Hard #5
5 8 6 7
8
1 5 2
8 1 2 3
5 6 4 3 9 2
1 4 7
3 5
6 2 7 5
4 7
Hard #6
8
5 7 6 3
4 7 9
1 3 7 6
3 7 9 8
9 6 1
4 6 2 5
1 5 9 8
4 5
Hard #7
1 3 7
2 5 8
6 2
3 6 9 1
7 4 8 5
1 6 7
3 2 5
2 9 6 4 1
3 8
Hard #8
4 8 1
7 1 3 8
6 9 5 7
2 9 1
8 5
4 6
4 5 6 7 3
8
5 3 2 8 9

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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