Printable Hard Sudoku

Set 1yhuc90. 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 2
8 9 6 7
7 2 1
1 8 4 6 2
3 1
7 5 8
3 6 9 4
8 4 7
1 9 5
Hard #2
3 9 7 4
6
8 2 5
2 1 7 3 9
9 6 2 7 1
4 6
3 2
2 9 3
5 7 9 8
Hard #3
8 6 2 5
1 4 7
8 9
2 8
1 5 8 4
4 8 9 6 2
7 6 3 9 5
9
1 7 4
Hard #4
4 1
7 2
9 3 4 1
5 8 3 4
6 2 3 9 7
7 5
7 9 2 8
7 3
6 9 3 5
Hard #5
1 9
2
2 3 8 1
8 9 1 3 4 7
6 5 8 1
3 4
1 5 6 2
8 4
7 8 9 5
Hard #6
4 1 6
5 2 8 4
9 8 3 5
7 4 9
8 1 2
2 1
4 2 5
5 3 2 8
5 6 8
Hard #7
4 9
3 2
8 3 1
7 6 2 5
9 5 8 6
7 6 8 3 9
1 6 7 8
5 9 2
3 6
Hard #8
7 8 1 2 4
3 9
5 7 4
6 2 5 1
2 7 6 3
1 2 9
3 9 7 8
7 6 4 1

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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