Printable Hard Sudoku

Set 1llrhf8. 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
4 3 7
2 7 5
7 8 2 1 6
2 9 4 8
6
4 7 5
5 7
3 5 6 1 8
7 2 9
Hard #2
5 9 7
1 2 4 6 5
6 5 9
6 8 4
7 3 1
2 5 4 7
4 8
9 5
3 7 6 4
Hard #3
1 7 9
5 6 4
4 2 3
7
3 7 5
2 4 3 9 8 7
9 7 3 4 1
9
6 1 2 4
Hard #4
1
9 4 8 7
3 8 9
2 7 6
8 3
4 2 6 9
2 9 1 5 3
7 5 1
8 6 7 4
Hard #5
2 1 8 9
8 5 2 3 7
7 6
5 8 3
1 9 3
4 5
6 2 8 5 4
2
7 6 9 2
Hard #6
3 6 5 2
9 6
4 3
7 4 9 3 2
9 8 7
4 9
1 6 4
3 1 6
6 7 8 9 1
Hard #7
3 7 9
5 4 6 1 3
8 7 3 6
1 8 4 5
9 6 3
5 2 8
4 8 5
1
9 7 2
Hard #8
6 7 1
5 9 3 4
3 8 7 9
8 2 1
5 2
8 9 6
4 8 5 1
6 8
3 5 2 7

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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