Printable Hard Sudoku

Set clg631. 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 1
6 3 4
4 9 2
1 4 9 2
2 6
8 6 1 5
4
4 5 3 7 8
9 2 5 3 6
Hard #2
4 8 7
1 6 3 9 8 2 7
4
9 4
5 2 1
3 8 6
7 2 8
1 5
2 6 5 4 9
Hard #3
7 1 8 4
3 2 9
1 6
1 6 7
8 9 1 5
5 4 2
4 8 6 7 5
6 9
5 8 6
Hard #4
8 5 1 4
4 1 9 3 7 6
6 9 8
5 7
5 8 4 2
5 4 3 9
7 2 6 8
8 2
Hard #5
8 9 2
6 3 4
3 7 6
2 7 9
6 8
4 8 7 2
5 1
3 6 9
1 8 4 9 7 3
Hard #6
6 2 4
8 9 3
2 4 8 6
9 1 7
2 4 7
8 1 4 6 9
9 3
1 5 3 2
7 6
Hard #7
7 1 8 3 6
4 5 2
3 2 4
2 7 1 8
4 9 8 6 7
9 5
4 3
3 8 2 1
8
Hard #8
3 2 9 1
1 8 4
2 3
7 6 1 4
4 2 8 7 9
9 3 4 8
6 4 3 8
7
7 1

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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