Printable Hard Sudoku

Set 1tu898c. 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
4 5 6 3
2 1
1 9 8
6 1 5 4
5 2 7 3
5 6 9
1 2 7 6
9
6 5 9 8
Hard #2
9 2 3
4 1 8 9
5 7 1
5 4 7 6
9 6 4 8
8
1
7 3 8
2 7 1 8 9 5
Hard #3
3 2 6 7
3 5 4
7 3 8
6 8 1
7 4 6
1 3 4 5 2
8 4 1
9
8 2 7 5
Hard #4
9 1
1 8
4 3 8 5
6 9 2 8
2 9 7 6
8 3 6 9
5 6 1
3 8
1 7 4 5
Hard #5
3 8 2 5
5 3 2
2 9 4 5 3 8
2 4
1 7 9
8 7 6 1
8 7
5
6 9 1 7
Hard #6
7 3
3 5 2 8 4
1 6 9 8
5 7
9 6 5
9 3 1
7
6 5 8 1 2
9 4 3 8
Hard #7
1 3 4 7 5 8
8
9 4 3 5 6
6 1 4
8 2 7
4 5 8 9
2 1
5 9
3 1 6
Hard #8
2 8 1 9
3 4 8 7 9
9 4
1
1 5
3 1 6 8
1 7
7 5 3 2
4 9 2 5 6

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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