Printable Hard Sudoku

Set 108uxwe. 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 1 6
7 8 4
6 3 5
6 5 1 9 7
7 6 2 9
2 8
9
7 6 4 5 8
2 7 1
Hard #2
3 5 2
8 1 5 7 9
4 7 3 1
7
3 8
6 9
2 1 6 8 3
3 5 4
5 7 6 4
Hard #3
6 1 8 7
3 7 5
1 9 2
7 9 3
3 4 6 5 9
4 1
2 7 6 1
9 8 6
4 8
Hard #4
3 8
5 1 8 3
6 7
6 8 2
3 4 6
4 9 2 8
1 3 9 4 7
2 8 3
9 7 4
Hard #5
6 9 3
8 6 5
5 3 9
7 8
2 8 9 6 1
1 3 4
1 4 3
6 2 5
2 9 7 8
Hard #6
7 1 5
7 5 2
3 6 4
1 4
2 9
4 3 6 7 2
8 4
2 5 1 8
9 8 4 2 3
Hard #7
6 2 9
9 4 1
7 2
8 4 5 1 2
1 6 4
2
6 7
3 5 4 1 8
7 2 1 6 3
Hard #8
4 1 2
3 5 9 6
8 9 4
7 5
1 5 6
3 9 2 7 8
9 3 7 4 6
6 8 4 3

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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