Printable Hard Sudoku

Set hpalt0. 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
6 2 8 5
4
3 1 6 2 7
7 2 8 9
3 5
1 3
8 9 7
1 9 7 5 2
6 2 4
Hard #2
7 3 1 5 8 9
8 6 3
4 2 9
9 4 1
1 4 3 2
8 3
2 1
8 2
9 6 5 2
Hard #3
2 1 7
8 6 2 4 3
1 4 8
4 6 1 5
4 2 5
3
1 3
6 2 3 9 7
3 5 4
Hard #4
2 6 4 7 3 5 1
5 6 9 4
4 2 8
3 8 2
6 1 7
7 2 1 4
9 3 7
5 3
Hard #5
9 4 3
5 4
8 4 7 1 9
5 9 6 7
1 8 4
2 8
2 3 6
4 9
5 6 9 8 1
Hard #6
2 1 5
1 4 7 6 3
3 6
1 8 4
2 7 3 9
7 9 5 3
2 1
7 2
4 3 7 9
Hard #7
4
9 8 4 5 7
7 9 6
5
8 6 5 4 7 2
2 7 3 4
3 2
5 6
8 4 9 2 3
Hard #8
2 4 5
1 8 5
4 2 9 3 1
5 8 3
9 2 5
5 6 9 7
5
7 1 8 4 3
8 4

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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