Printable Hard Sudoku

Set r0d4wj. 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 8
3 8 6 4
4 3 5 2
1 5
5 2 6 9 3
9 7 4
4 9 1
3 2 6 4
8 5
Hard #2
4
3 2 4 9
6 1 2 3
7 2
8 5 6
1 3 8 9
5 9 8
9 3 1 6
4 5 8 1
Hard #3
1 2 9 4
7 2
3 9 6
9 1 5 3 7 8
4
5 8 3 7 2
5 6 9 1 7
2 8
9
Hard #4
1 5 3
4 8 5
7 2 4 6
8 2 6 9
5 2
1 3
7 1 9
2 8 9 1 5
2 7 8
Hard #5
4 2 8
6 7 1 3 5 4
7 1
5 2 6
4
7 9 1
8 3
8 6 3 4
1 9 5 6 4
Hard #6
5 4 1 2 7
9 8 6
7 2 1
5 6 3 2
1 6
7 3 4
5
2 1 8 3 9
1 5 2
Hard #7
5 1
7 5
2 6 8 7
5 1 4
3 9 2 5
4 2 7 1
3 7 6 5
9 5 1
3 7 8
Hard #8
2 1 4 6
4 5
3 5 6 8
3 9 8 7
6 8
2 9 7 3
7
8 6 4 7
1 4 9 3

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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