Printable Hard Sudoku

Set 1urdt6r. 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
6 7 3 1
4 6 8 2
8 9 2 6
3 1
7 6 4 9 5
5 1
4 8 5 9
1 6 3
7
Hard #2
3 1 6 4
6 4 7 8 1
8 5 7
5
9 8 1 3
7 6 9
8 9
9 1 3
8 5 9 2
Hard #3
4 5 6
6 4
2 5 7 1
3 2 4
8 7 5
9 3
2 4 3 8 5
5 4 3
7 9 6 4
Hard #4
9
3 2 7 4 6
9 8 1
3 2 9
8 9 6 2
6 1
6 3 8 2
2 4 5 1 3
7 1
Hard #5
4
2 1 8 4 3 7 9
8 7 2
6 3
5 8 3 1 2
3 9 1
5 2 8
1 4
3 6 8
Hard #6
4 1
5 9 7 2
7 2 8
1 6 7
3 4 6 9
9 4 3
3 6
1 8 4
7 6 8 5 3
Hard #7
1 8 9 5 7 6
2
5 3 2 8
3 1 7
1 4 6
1 6
2 9 8
4 2 5
1 7 6 9
Hard #8
7 5 2 6
6 4
1 7 8
2 8 3
4 2
9 6 3 8
7 3 2 1 5 4
7 6
8 4 7

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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