Printable Hard Sudoku

Set 17iyvyt. 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 6 3
3 2 1
2 9 1
2 3 9
5 4
4 5 2 7 8
1 3 8 9
6 1 9
7 6 3
Hard #2
6 1 9 3
1 7 5
9 4 8
1 2
8 3 9
6 2 8 5 1
9 8 2
8 5 4
8 5 7
Hard #3
9 6 5
8 4 6
2 1 9 8
1 2 5
2 3 6
3 8 9 1
7 3 2
9 4 3
6 8 4
Hard #4
1 3
2 6 8 9
3 1 2
5 4 8 1 7
4 7 3 9
5
5 9 2 3 4
5 1 7
9 8
Hard #5
7 1 5
9 6 8 2
1 5
9 3 5 6 7
6 9 5
5 3 2 4
3 9
8 1 9
1 4 3
Hard #6
4 7 1
3 6
4 9 5
7 1 3
1 4 8 7
5 8 7
8 9 3
2 4 1 8 5
5 6 4
Hard #7
6 1 2 5 3
6 3
7 8 5 1
7 3
6 4 5 7
5 8 3 9
8 7 2
6 5
8 7 1
Hard #8
6 3 5
5 3 4
6
1 9 4
4 9 3 2 5
6 4 7
6 3 8 5
7 5 3
1 4 8 9

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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