Printable Hard Sudoku

Set 1s3tgn5. 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
5 8 4 9 2
8 6 4
2 3 9
9 8 1 6
9 1 8
6 3
4 7
3 2 1 5 8
Hard #2
2 7 1
6 3
8 9 4
5 8 2 3 6
9 7 8 6 2
5
3 4
7 8 5
5 8 3 6 7
Hard #3
8 1 3
3 4 6 8 7 5
2
7 5 6
6 7 4 9
2 1
7 9 8
6 2
4 3 9 7 5
Hard #4
2 3 1
4 9 3
1 9 2
8 2 4 9 6
6 5 2 8
9 5
4 6
9 2 7
1 5 7 6
Hard #5
6 2 8 5
4
3 1 6 2 7
7 2 8 9
3 5
1 3
8 9 7
1 9 7 5 2
6 2 4
Hard #6
7 3 1 5 8 9
8 6 3
4 2 9
9 4 1
1 4 3 2
8 3
2 1
8 2
9 6 5 2
Hard #7
2 1 7
8 6 2 4 3
1 4 8
4 6 1 5
4 2 5
3
1 3
6 2 3 9 7
3 5 4
Hard #8
2 6 4 7 3 5 1
5 6 9 4
4 2 8
3 8 2
6 1 7
7 2 1 4
9 3 7
5 3

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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