Printable Hard Sudoku

Set 1fp5np6. 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
1 4 3
5
3 4 1 7 6
7 3 2 5
3 8 9
2 9 8
9 1 4 6
7 1 5 2 4
6
Hard #2
8 1 9 7 2
7 6 3
8 2
4 9 8
6 7 3 5
1 5 8 2
5 8
8 4 2 5 6 1
Hard #3
7 5
3 1
1 6 2 4
1 9 4 3
3 5 2 6
4 1
3 8 7 2
6 1 3
2 4 5 7
Hard #4
3 4 2 6 8
6 7 3
2 6 9
7 2 1
3 8 1
7
2 8 5 1
1 8 3
5 7 6 9
Hard #5
8 3 7
7 9 8 1 5 6 2
1 6 8
6 4
5 1 2 7
1 4 9
5
9 3 8 4
4 9
Hard #6
5 4
4 9 7
3 6 1 5
8 5 7
7 3
7 5 9
9 2 5
7 3 1 9 6
6 3 4 2
Hard #7
1 9 5 6 4
5
5 8 3 1 4
4 5
3
3 1 6
2 6 7 8
5 7 8 9
6 4 7 1
Hard #8
3 8
3 7 1 5 6
2 6 1
5 8 3 7 6
3 5
6
8 6 7
4 1 7 2
1 3 4 5

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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