Printable Hard Sudoku

Set 1cscdu6. 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
1 5 8
7 2 6 1
6 1 9 2
5 7 9
1 8
2 4 3 5 6
6 5 7 3
5 9
7 2
Hard #2
3 6 1
6 2 8 3
4 8 1 5
1 7 8
5 8
2 4
3 9 5 4
4 1 8 7
4 3 1
Hard #3
8 7 4
1 4 8
5 9 7
7 9 5 1 4
9 8 6
6 7
9 2 1
3 5 7
1 6 9 3
Hard #4
7 5 6 3
2 7
9 8
9 5 8
6 4 1 2
3 9
5 7 2 6
2 6 9 4 1
4 8 1
Hard #5
3 9 6 5
7 4 9
2 9 1
4 6 7
2
2 1 5 3
5 3 9
6 4 7 5 1
2 7 3
Hard #6
2 7 1
9 5 2 7
8 9 5
4 3 8 2
5 1 3
8 6
8 6 5
5 6 9 4
5 7 8
Hard #7
2 3
9 8 2
3 1 6 7
9 2 1
6 3 4
8 9 4 6 2
7 9 1
5 9 6 8
9 2
Hard #8
7 5 8
9 4 2
2 1 6
2 3 9
1 9 4
8 7 1 6 5
7 9 2
2 4
9 6 4 8

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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