Printable Hard Sudoku

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

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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