Printable Hard Sudoku

Set stj4iu. 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 3 7 6
4 2 9
6 4 2 3
2 9 1
3 1 4
7 4 6 5
3 8 6
7 5
5 4 8
Hard #2
2 9 1
3 7 6
1 4 6 3 7
1 8 7
2 9
4 1 8 2
9 6 4 3
2 8
6 8 5
Hard #3
2 4 1
8 3 1
4 7 2
7
6 5 9 8 2
6 7
1 4 9 6 5
2 7 8 3 4
8 2
Hard #4
7 5 9 1
5 3
4 6 5
4 6 3 2 9 1
7 5
3 4 8 6
5 2 4
4 8 1
2 9
Hard #5
8 3 9 5
6 8 9 3
8 3 6 5
3 1 7 5
4 8 1
5 3 6 1 4
9 7 5
4 1
Hard #6
2 7 4 1
5 8 6 9 3
6 2 8 5
2 7
9 6 7
6 2 5
5 3 6
4 9
3 9 8
Hard #7
6 9
2 7 1 8
6 9 4 2 3
9 7
3 5 8 4
6
8 1 7
2 3 7 9
9 1 5 2
Hard #8
4 6 1
7 3 2
7 5 8
4 8 3
5 2 1 7
1 4 6
8 3 5 9 1
5 8
6 1 9

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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