Printable Hard Sudoku

Set yid8j9. 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
8 2 4 3
8 3 6
3 8
3 6 9 8 7
4 1 5
2 5 4 8 3 1
8 6 5
4 6 2
Hard #2
4 3 5
3 9 6 1
5 7 2
3 1 4 2
6 8 7 3
9 4
9 4
2 7
2 3 5 6 1
Hard #3
1 6 9 8 4
3 1 8 6 9
2
3 2 7 9 1 5
4 3
9 1 5
1 7 9
4 1
7 3
Hard #4
8 6 3 7
3 1 4
5 2
8 5 1 9
7 4 5
9 1 2 4
4 7 2 8 5
2 6
3 8
Hard #5
4 7 2 6 5
3 5 8
5 9 1 2
4 9 6
2 1
8 3 4 2
4 7 9 3
5 6
1 3
Hard #6
4 7 2 5
4 3 1 9
8 4
5 2 8 9 1 3
9 7 3 5
7 4 2
9
1 5 6
4 8
Hard #7
5 1 3 7
8 2 9 1
2 6 1 8 4 7
2
4 8 5
2 8
7 5 9 3
2 8 4 6 1
Hard #8
9 8 2
2 5 3 9 8
8 5
3 2 5 9
9 8 7
1 3 5
4 6 1
8 3 9
6 9 7

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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