Printable Hard Sudoku

Set 1v2umk5. 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 8 1 9 3
7 3 5 6
6 4 1
2 6
4 8
9 3 7 4 5
5 3 7 4
7 3
9 6
Hard #2
5 9 6 3
7 4 2
1 7
9 6
9 2
3 2 7 8
5 7 1 6 4 3
5 6
9 5 7 1
Hard #3
4 7 5
2 5 7 3 4
9
5 3 1 2
1 9 3
6 7 2 8
4 2 9 1
3 1
2 8 7
Hard #4
1 9 8 6
9 6 5 2 3
9
2 5 6
4 8 2
6 7
8 4 9
2 9 4 3 1
4 3 5
Hard #5
9 5 4
8 3 2 6
7 8 9
8 6 4
2 7 9
6 2 7
7 5
6 1 9 2 3
3 4 8
Hard #6
8 2 9 5 1
1
7 1 4 6
6 9 4
5 7 1 4
3 8 6
9 1 7 2
6 8 5 3
7
Hard #7
1 7 6 8
4 5 9
3 2 9
2 9 6 8 3
8 3 1
7 6
9 6
5 2 7
2 3 9 1
Hard #8
7 5 8
8 1 7
8 2 6
5 4 3
8 6 3 1
1 9 8
3 1 6 2
2 9 8
6 2 5

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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