Printable Hard Sudoku

Set i1x7c5. 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
5 7 6 3
9 5 2
6 1 2 8
3 6 2 4
4 5 3 6 2
7 9
1 2 9 8
7 3
3
Hard #2
1 2
7 6 1
8 2 1 9 7 4
5 8 2 3
3 9 7
5 6 8
4 1
1 4 8 9
6 9
Hard #3
1 4 9 3 5 8
6 5 9
7 4
8 6
8 5 3 9
8 2 7
6 1 7 4 9 3 8
6 5
Hard #4
7 9 8 6 3
1 2 5
9 7 2
4
9 2 3
3 8 7 1
5 4 6 1 3
6 9
2 5 8
Hard #5
5
3 5 1
6 4 3 9
8 2 7 1
1 9 3 5
6 1 3 8
6 1 5
8 7
3 6 9 2
Hard #6
1 7 8 4 6 9
7
4 1
9 3 4
6 8
3 5 7 2 6
1 6 3 8 9
4 8 1 2
2
Hard #7
4 5 3 6
8 2 1
9 8 5
3 5
1 3 9 7 6
7 5 6 9
6 3
3 4 9
7 1 3
Hard #8
1 3 2 5
7 5 8 6
9
4 6
1 7 3 8 2
2 9 8 4
1 4
1 7 3 6
3 2 7

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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