Printable Hard Sudoku

Set 1cj6fyj. 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 5
5 2 7
1 4 8
9 8 1
5 7 9 1
4 8 3 9
2 6
3 5 4 8
8 3 5 4
Hard #2
1 7 4
8 3
5 4 1
7 4 6
8 5 4 1 3 2
3 9
6 8
1 3 2
8 1 9 7 4
Hard #3
9 4 5
6 1
9 4 8 6
3 4 1
7 1 8 6
2 3 8 5
4 1
8 5 2 9
1 4 8
Hard #4
1 4 3
2 5 1
8 7 3 6 5
8
9 4 7
7 9 8 6 3 5
6 2 9
2 5 4
7 2
Hard #5
9 7 6 3
5 3 1 8 4
8 9 5 6
5 8 1
2
2 3 7 5
7 6 9
8 2
9 3 1
Hard #6
5 1 2
7 2 6
3 6 2
2 7 8 5
9 8 3
3 2 5 9
2 9 7
6 3 1
8 4 7
Hard #7
5 6 1
9 7 5 3
1 8 2
4
3 9 4 5
7 1 6
8 4 9
4 9 7 6 3
9 8 5
Hard #8
8 4 1 3
9 5 2
1 7 6
5 2 6 9 7
1
6 2 5 8 3
3 7 1
7
7 4 5 8

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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