Printable Hard Sudoku

Set mkpud6. 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
8 2 5 3
6 8 9 4
9
1 8 4 3 6
5 6 3 8
2
2 8 9 4 5
5 7
3 2 1
Hard #2
6 2 9 7
1 9 7
8 1 2
8 6 2 9
5 8 6
8 4 9
2 1 5 3 8 7
7 4 3
Hard #3
7 9
8 6
8 4 1 2 5
1 6 5 2 7
3
3 9 7 4 5
3 6 8
4 8 1 2
2 3
Hard #4
3
9 2 3
3 1 8 9
2 1 9
8 5 1
9 8 4
9 2 3 6 7
7 2 3 5
5 6 8
Hard #5
2 6 9
3
8 2 4 6
7 8 4
2 3 8
6 8 4 1 3 9
5 7 2
3 6 2
9 1 5
Hard #6
4 9 1
2 5 3
4 6 7 9 8
3 4
5 2 4
3 2 6
4 6 3
7 6 5 1
8 9 2
Hard #7
6 5 2 8
9 8 4
3 7 4 2 6 5
5 6 1 8
4 1 2 6
4
9 2 7
1 3 5
1
Hard #8
9 1
6 3 8
7 1 4 3
9 6 1
7 5 8 1
8 6 2 5
6 5 3 9
8 4
4 3 2

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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