Printable Hard Sudoku

Set 18486wb. 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 1 2 8 5
5 6 4 1
7 3
9 8 7
3 8 4 6
3 9 2
1 7 3
2 7 3 1
Hard #2
5 1 2
1 7 8 5
9 1 8
7 8 5 4 9 2
2 9
3 1 4
1 6
3 9 1
6 2 7
Hard #3
9 6 4
8 3 7 2
9 3 8 6
5 9 1 6
1 6 5
8 7 4
7 4
1 3 2 8 5
8
Hard #4
3 1 5
2 8 5 6 3
3 2 4
6 7 8 1
7
9 2
3 5 1
5 6 7 9
1 2 4 3
Hard #5
8 7 2 6
3 6 1 5 2
1 9 7
6 8 7
2 9 8 1
4 1
9 5 7 2 4
2
8 3
Hard #6
4 7
9 8 6
8 4 5
8 9 3
7 9 3 5 6
4 2 9
3 1
3 5 1 9 8
1 9 6
Hard #7
5 7 2
7 4 6 9
3 5 8
6 1 4
4 6 2 5 1
3 8 7
9 8
1 5
1 9 4 8
Hard #8
4 8 1 2 5
5 3 6
1
4 9 5 3
7 4 9 1 2
1 8 6
4 2 9
7 4
7 4 6

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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