Printable Hard Sudoku

Set 6lj9zj. 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 1 7
3 4 1 7 9
4
7 2 1
5 4 2
9 8 5
1 9 6 8 3
4 7 9
3 8 9
Hard #2
4 8
9 4 5 7
1 3
4
2 5 9 1
7 2 1
8 1 3 7 9
2 7
5 7 9 8 4 6
Hard #3
8
3 5 9 8
6 9 4
7 2 4 3 6 1
2 1 6 7
3 8 2
5 7
2 6 4 9
1 8
Hard #4
2 7 4 1
3 4 7
1 5 3
1 9 4 8
2 9 3
9 8
9 7 6
7 9 5
2 5 4 1
Hard #5
2 8 7 9
5 4 3
4 2 6
6 2 9 4
9 1
5 4 6 3
2 4
3 2 5 1
8 7 9
Hard #6
1 2 3 5 6
7 2 4 9
8 1
2 5 8 7
3 6 2
6 1 9
5 8
4 7 1 5
6 7
Hard #7
4 3 1
1 8
7 5 6 8
7 2
8 7 6
2 4 3 1
1 6 9
3 6 9 4
9 6 4 1
Hard #8
7 9 3
9 4
6 1 7
1 5 8
2 7 6
9 6 1 2
6 5 7 2
3 9 6
2 8 1 4

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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