Printable Hard Sudoku

Set z1ecwr. 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
9 1 4 7
9 1
6 5 8 7
8 7 4 2
1 4 5
3 4 8
6 2 3 9
3 5
4 7 2
Hard #2
1 8 6 3
6 5 8
2 9 4
7 3 1
8 3 5 2 6
8 9
4 3 6 9
9 7 4
2 4
Hard #3
7 1 5
1 3 4
6 7 3
1 4
2 1 7 4
8 7 3 6 1
2 7
2 6 8
5 8 1 2
Hard #4
6 3 9
1 5 8
8 3 1 9
3 4 6 2
6
2 1 5 4
6 8
5 4 2 1
2 9 5 4
Hard #5
9 6
3 6
4 5 7 9 3 6 1
4
1 7
3 2 7 8
5 2 9 6
4 5 8
9 5 6 1
Hard #6
2 5 9 7
3
8 9 2
5 7 2
7 6 4 2 8 3
4 8 6
6
4 9 3 7
7 2 4 5
Hard #7
6 7
8 2 5 4
1 6 4 8 2
2 4
7 4
9 5 6 8
2
6 7 8 9
4 2 5 8 6
Hard #8
6
6 1 9
7 5 8 2
4 6 5
4 9 2 6 3
8 3 7 2 9
6 4 3
7 8 4
3 9

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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