Printable Hard Sudoku

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

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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