Printable Hard Sudoku

Set rtjm4i. 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
3
6 7 1 3 8 9
2 8 7
5 1
1 8 7 9
9 2 5
9 5 8
7 2 5
2 1 6 3
Hard #2
6 2 1 9
3 1 7
1 3 7 4 8
9 2
9 6 8
1 4 6
4 2 5
8 2 1
9 3 7
Hard #3
5 7 8
7 6 3 8 1
2 6 5
6
1 8 2
6 7 3 8
1 6
3 9 2
2 4 7 3 9
Hard #4
5 3 6 1
7 2 3
6 9 4
9 4 8 5
5 4 3 6 9
6 1
7
2 9 4
4 1 7 6
Hard #5
9
8 7 2 3
2 4 8 5
5 8 4 3
6
9 6 7 4 5
1 6 3 4 2
9 6
2 5 6
Hard #6
4 5 8 9
9 5
5 8 6 4 1
2 5 9 6
8 9
5 3 2 1 4
8 7
2 6 1 3
4
Hard #7
9 7
4 6 8
9 7 5 2 4
5 7 3
1 3 5 6
9 6 5
8 5
4 7 6 1
9 1 4
Hard #8
7 1 9 2
6 8 9
9 6 3
5 2 8 7 6
7 5 2
3 4 1 7 8
4
8 7
3 7 8

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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