Printable Hard Sudoku

Set 1fr3imj. 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 3 7 4
2 9 8 3
7 2 1
4 8
8 1
3 5 7
7 9 5
8 5 2 6
4 9 1 7
Hard #2
2 8
5 9 1 6
8 6 4 3 9
1 3 9 6
8 5
8 1 3
5 1 2
8 3 7 5
3 7
Hard #3
9 2 8
8 2 7
1 3 5 6
9 7 4
3 6 4 8 7 5
8 7 1
7 4
4 2 5
3 1
Hard #4
7 8 9
8 1 5 2
4 8 5
2 1 6
6 3
3 7 2 5 1
2 3
2 3 1 8
5 2 1
Hard #5
9 4 3 2
1 4 7
3 8 6 9
5 6 2 8 9
3 6
2 1
9 4 8
6 8
1 4 2 7
Hard #6
5 1
9 3
7 3 8 1 6
8 6 5
1 7 9 3
7 9 4
6 5 4
3 2 6 4
1 2 6
Hard #7
2 1 4 6
5 8
4 7 1
7 4 8 9
7
1 2 7 6
6 8 5 9 3
6 5 1 7
3 9
Hard #8
7 4 3
9 4 5
5 1 7 2 9
3 7
6 3
1 6 7 4 2
7 2 6 1
1 5
9 5 3

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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