Printable Hard Sudoku

Set mckc6e. 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
2 3 9
5 8 7 2
8 6
1 6
2 8 3
4 6 5 2 7
4 3 7 5 8
6 4
1 6 9
Hard #2
8 6 1 7 3
2 6
3
6 2 9 3 5 7
5 9
9 1 7 6 4
3 5 4 1
9 3
2 5
Hard #3
1
2 8 4 3 7
6 2 4
4 2 8
1 2
3 6 7
2 1 8 5
5 7 9 2
8 4 3 7
Hard #4
4 3 2 5 8
7 3 6
8
2 6 8
3 7 4
5 6
6 5 3 1 7
7 5 6
7 2 1 3
Hard #5
4 6 3
8 7
3
2 9 5 7 4
3 8 9
4 3 6 5
3 2 9 4
1 2 5 9
6 8 4
Hard #6
4 5 8
2 7
8 6 3 7 5
3 8 1 2
2 7 3 5
1 3 8
3 2
9 5 4 6 3
8
Hard #7
2 1
7 2 3 9
9 3 1 8 4
9 4 2 5 3
3 2 4 6
8
2 1
6 7 4
8 3 2
Hard #8
7 5 8 9
3 7
8 1
4 9
9 6 7 8
6 2 3 5 1
2 3 7
7 1 4
8 6 5 2

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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