Printable Hard Sudoku

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

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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