Printable Hard Sudoku

Set emck40. 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 6
5 7 4 6 3 8
8 9 1
9 3
8 3
7 6 2 4 9
4
8 9 5 3 4
2 8 7
Hard #2
6 3 8 2
7 1 4 6
6 3 9
2 3 9 5
4 8 1
7 9
7 4
3 1 2
5 7 8 6
Hard #3
9 8 3
6 8 1
4 2 5 3 8
2 8 7
5 9 4
1 6 8 9 5
1 4
6 9 7
8 2
Hard #4
6 3 1 4
2 6
7 8 3
5 2 3
8 7
8 1 3
7 3 9 4
9 1 8
7 5 4 1 2
Hard #5
1 5 9 3
9 6
1 3 6 8
8 5
9 2 6
4 5 1
1 8
2 8 9 4
3 7 8 6 2
Hard #6
8 6 4 5
2 7
5 1 6 9
8 5 3 6
1 2 4
9 5 8
2 1
9 5 2
5 8 4 6
Hard #7
8 2 1
5 3 7 6
6 1 8 9
3 9 5 4
7 1 8
5
1 2
2 1 7 3 4
3 1 6
Hard #8
4 7 1
4 6 3
6 8 4
2 4 3
7 3 9 6 4 2
2 8
1 8
4 9
6 9 3 4 5

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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