Printable Hard Sudoku

Set 117indx. 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 4 3 7
8 4 1 9
8 2
7
4 5 3 6 2
9 3 5
2 7 8 3 6 5
5 1
3 6
Hard #2
7 1 3 4
5 2 1 7 9 6
8 5 7 1
7
4 9 8 5
1 9 6 8
3 9 8
4
7 2
Hard #3
4 3
9 2 7
4 3 7 1
7 1 3 9 6
3 6 5
9 3
2 1 7 8 9
3 2 5 8
1
Hard #4
4 5 9 7
9 8 1
2 4
6 3 1
1 5 3
4 3 9 8
4 1 6
6 5 2
5 3 9 4
Hard #5
5 4
2 8
4 6 1 9
6 3 4 5 2
7 9 3
2 6 1
3 7
8 5 2 3
9 4 5 3
Hard #6
8 3 5
4 2 7
2 8 3 1
2 1 7 4
3 1
1 4 2 9
9 4 2 5
6 8
8 9 5
Hard #7
1 9 3 7
8 6 7 9 4
5 6 1
7 2 1
9 3
2 5 4
2
6 9 5 4
8 6 2 1
Hard #8
6 3
5 3 2 9 1
2 5 1 4
8 5 3 4
8 7
1 4
8 6 7
6 4 2
9 2 3 6

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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