Printable Hard Sudoku

Set 1s5ik35. 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
3 4 5 6 7
4 5 7 1 2
5 9
8 4 3 9
3 1
2
6 9 2 4
5 9 8
7 4 1
Hard #2
8 2 6
1
1 4 3 9
4 6 1 3 8
9 7 6
2
6 5
3 4 8 2 9
7 3 1 8 4
Hard #3
5 7
7 9 4
4 9 6 5
9 2 5
5 8 3
3 2 4 8
2 4 5 1
7 6
6 9 7 1
Hard #4
4 1 6
8 1 9 4
2 9
2 3 7 9 4
4 5 1 3 7
3 5
2 1
9 1
8 4 7 2
Hard #5
2 9 7
7
4 8 9
5 3 8 4
7 4 2 8
5 6 1
8 7 6 5
9 4 3 8
7 4 2
Hard #6
7 6 3
8 4 9
3 8 4
2 5 7 3
9 6 4 2 5
6 4 3
5 6 2
9 2 8 6
4
Hard #7
6
3 1 9
2 3 6 1 7
5 2 6 3 9
4 9 2
5
6 7
8 7 1 9 6 3
5 8 2
Hard #8
7 8 9 2
2 4 3 7 5
6 8 3
9 5
8 4
4 9 1 2
5 7 3 1
6 2 9 8 7

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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