Printable Hard Sudoku

Set 1304te9. 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
2 9 3
1 3 2
9
3 5 6 8
9 4 1
5 7 1 2
2 4 5 8 7
1 6 4
7 8 1
Hard #2
1 4 2 3
8 6 1 4 7
9 3
8 1 5
1 7 2 4 9
9 6 1 3
7 6
9 7
8 4
Hard #3
1 2 8
9 3 4
2 5 3 8 7
1 6 7 4
2 4 5
6 3 9
9 7 3 6
4
4 6 8
Hard #4
1 7 9
4 7 3 2
8 6 7 4
7 4 5
2 8
1 2 3
3 2 5 8
5 9 3 6
6 7
Hard #5
4 3 1 9
5 2 3 4
8 9
2 3
9 8 3 7
1 9
6 3 4 1
2 5 6 7
1 5 9
Hard #6
6 2 4 5 9
5 2 1 8 4 6
7
8 1 7 2
5 3
3 5 6 8
1 9
5 1
6 8 2
Hard #7
8 5 1
4
9 3 7 1 6
5 7 2
9 6 8 4 7 5
2 6 8
2 1
3 5 6
9 3 5
Hard #8
5 1 7 6
9 4 7 8
2 5
7 6 1
4 2 5
6
2 9 7
8 4 7 6 1 2
2 9 6

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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