Printable Hard Sudoku

Set 9rgen5. 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
5 3 9
6 1 4 5
5 3 8
3 6
4 5 1 9
9 4 3 1
2 6
8 3 4 7
7 8 4
Hard #2
9 3 6 5
2 3
8 7 5 1 3
1 5
4 5 9
2 4 6
8 9
7 6 2 9
3 6 7 9
Hard #3
4 2 1 9
9 6 1 8
6
4 1 2 5
5 7 6 4
7 6 5 1 9
6
2 8
4 9 8 3
Hard #4
6 4 5
1 7
8 5 3 6 7
5 3 8 1 9
4 2 8
7 8 6 5 1 9
3 8 6
1 4
Hard #5
4 5 7
5 7 8 2
3 6 2 4 5 1
5 3 6
6 8
4 7
8 4 9 6
3
1 2 9 8
Hard #6
8
7 6 4 5 1
1 3 8 7
2 5 7 1
9 7 5
6 2
4 5 3
7 8 2 9
8 9 4
Hard #7
6 4 3 1
6 3 1
9 2 8 6 4
4
7 4 1
2 1 8
6 3 8 5
9 3 8 7
1 9
Hard #8
1 5
5 2
8 4 3
1 6 3
9 1 4
7 6 2 1
3 1 2 8
3 9 5 4
8 6 4 1

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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