Printable Hard Sudoku

Set 16a644. 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
7 9
5 9 4 7
6 2 8 3 1
8 6 1 2
4
9 7 2
3
4 8 9
2 7 4 1 8 3
Hard #2
2 5 9 1
3 6 4 7
1 5
4 6 3 1 5
8 1
4 9 2
9 8
8 4 2
5 7 2 3
Hard #3
3 7 9 1
2 9
9 1 4 7
8 3 6 1
1 7 5
6 1
8 9 2
5 6 3
3 4 5 8
Hard #4
6 5 9
4 2 7
8 2 3
7 6
2 9 1 8 5 7
5 1
3 2 1
2 9 1 7
4 3 6
Hard #5
9
7 9 3 4 1
5 1 6 8
7
2 5 3
2 6 3 9 5
4 2 1 7 8
1 7 2
9 3
Hard #6
7 6 1
2 3 1 9
8 3 7
1 9 3 4 7 6
5 9 2
2 6
7 2 9 3
4 8
6 1
Hard #7
3 7 1 8
4 5 6 3
1 3
1 7 2
9
7 5 2 3 4 1
5 1 3 8
1 6 7 5
4
Hard #8
9 6 1 5 7 8
7 1 4 3
2 8 9 3 1
9 1 2
6 4 5
2 7
6 7 3
3 1 6

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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