Printable Hard Sudoku

Set 1c7niy4. 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
6 2 7 4
4 2 5
1 5 7 8
9 3 6
6
2 3 8 9 7
7 6 9
6 4 2 8
1 4
Hard #2
2 8 5
6 1
1 8 3 5
8 2 1
3 4 2 7
8 4 6
5 4 3
3 7
1 6 8 9 7
Hard #3
6 3
7 8 6 9
1 5 3 8
3 7 8 4
2 3 1
1 4 9
4 9 8
1 7
2 9 3 1
Hard #4
2 9 3 4
5 7 9
1 5
6 1
2
1 3 9 2 7 5 6
4 9
2 5 8 9 6
5 1 7
Hard #5
8 2
4 6 2
3 2 7 5
1 7
7 9 6
7 6 4 2
6 4 8 5 3
7 1 6 2
5 9
Hard #6
3 1 7 4
2 6
7 6
5 3 9 1
9 6 2 3
8 5 9
8 3
2 6
2 3 4 1 5 8
Hard #7
4 6
2 9 4 3 7
5 3 2 9
4 2
7 6 5
2 9 5 7 8
2 5
4 1 7
3 8 1
Hard #8
7 1
3 1
9 5 1 2
2 4 1 5
5 4 3
9 3 6
7 8 9
2 4 9 8
5 8 7 1

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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