Printable Hard Sudoku

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

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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