Printable Hard Sudoku

Set 18j0tf9. 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
8 1 4 6
2 5 7 9 1
9 8
7 4 5
2 5
4 5 3 8 1
1 4 8
3
4 2 1 8
Hard #2
3 7 1
8 3
3 6 1 8 2 9
4 5 1 6
3 1 9 4
2 7
5 7
6 3 4 7 2
3
Hard #3
2 3
4 8 7 5
4 1 9 7
5 4 6
8 4 9 7
2 8 1 9
3 1 7 4 2
3
7 6
Hard #4
7
5 6 2 7 8
9 8 7 4 5
8 4 6 5
2 4 3 7
8 1
1 3 4
9 7 3
3 8
Hard #5
2 1 3
6 4 8
6 4 1 7
4 5 6
6 7
3 6 8 5
5 1 2 8
1 5
8 9 4 7
Hard #6
3 5 6 8 4
4
8 7 9 4 2 6
2
6 8 1
2 7 6
3 4 5 8
5 4 9
2 4 3
Hard #7
7 8 5
2 3 8 6
9 6 1
3 2 7 5 9
8
7 2 9
4 6 1 5 2
7
5 4 1 8
Hard #8
9 2 4 6
1 2
6 3 7
9 5 7 2
6 1
1 3 7 8
6 3 8 9 5
4 1 3
5 7

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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