Printable Hard Sudoku

Set u0hypk. 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 9
7 2 8 5 6
3
1 3 4 6 8
2 8 1 6 9
1 8 6 3
7 4
9 7 1 2
Hard #2
8 3 1 6 2 7
9 4 1 6 2
9 3 8
3 7 9
5
9 1 7
6 7
1 6 7
3 5 4
Hard #3
6 8
5 9 1 2 6
7 4
1 9 3
7 6 8
8 6 1 9
2 3 7 1
8 4 5
4 6 8
Hard #4
4 7 1
8 6 9
3 7 1
5 3 8
7 2
8 4 7 5
2 9 8
7 9 6 4
4 2 6 9
Hard #5
5 9 3
3 6 8 2
7 8 3 1
2 8 3 7
8 6
9 1 4 8
6 1 3 5
5 4
2 9
Hard #6
6 1 9 7
1 9 7 6 8
7 2 3
4 7 9
3 6 9 5
5 2
8
2 1 5 4
5 9 3
Hard #7
2 1 9
7 5
4 7 8 3 5 1
1 2 4
6 9 1 7
7 3
8
7 6 5
5 8 6 1 2
Hard #8
1 4
1 2 3 6 5
5 7
7 6 4 1 2
9 2 5 3
5 9 1 8
5
4 8 2 6
3 1

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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