Printable Hard Sudoku

Set ud2r18. 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
7 9 6 1 2
1 2 3 7 4 9
6 5
2 1
4 3 8
3 5
7 2 8
3 6 1
4 8 7
Hard #2
4 1 5
2 3 1
6 9 3
4 2 9 7 8
7 3 5
6 4 5 2
1 4 8
3 7
1 2 9
Hard #3
6 5
2 4 9 7
1 2 8
1 3 9
4 7 5 9 1
4
6 5 2 7
7 5 3
2 3 6 1
Hard #4
4 3 5
5 4 6 1 3
2 9 6
1 2 3 6
7 4
9 5
2 9 3 7
1 5
3 6 9 2
Hard #5
4 6 2
9 5 1
5 8 4 7
1 4 3
9 7
8 5 3 4 1
8 2
3 2 9 5
6 1 2
Hard #6
4 6 2
5 6 3
7 9 1 8
1 7 4 6 9
9 7 8 6
9 2
2 3 9 7
1 9
8 7
Hard #7
8
2 9 1 5
1 4 6 9
1 7 8
1 2 4
7 2 9 5
2 3
5 9 6 1
4 7 9 8
Hard #8
6 3
5 9
6 7 9 8
4 6 2 9 1
1 5 9
8 4
3 1 4
7 5 8 3
9 2 4 3

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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