Printable Hard Sudoku

Set tlftu7. 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 8
2 7 1
8 3 1 6 7
2 8 1
4 6 3 7 2 5
9 4
4 9 2
6
1 9 7 8
Hard #2
5 7 3
7 8 4 5 6
6 5 9
2 1 3 5
8 2
1 9 2 6 8
4 2 1 3 9
2 5
Hard #3
9 8 3 6
5 1
2 3 4
1 5 4 7
6 5 7
7 8 9
7 1 6 3
9 7
2 6 9 5
Hard #4
4 3 5 2 9
6 3 2 8
7 9 3
4 6 8
8 3 4 7
9 5 6
5 4 1 9 2
7
2
Hard #5
7 9 4 5 2
1 6 2 5 9
2 9 3 6
3 9 1
9 5 1 4
8
3 1 6
9 7 4 5
Hard #6
2 7
9 1 6 2
6 1 3
1 6 4 8
2 8 3 5
8 6
3 5 4 9
9 8
8 2 1 9
Hard #7
2 8 9
7 3 9 5
8 7 2
7 3
7 6 4
1 6 2 9 4
3 7 2
5 3
8 4 2 1
Hard #8
3 4 9 2
2 7 6
1 9 6 5
4 5 8 1
2 7 9 5 8
7
1 3
9 6 7
2 5 8

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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