Printable Hard Sudoku

Set 1kr08i. 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 4 3 9 6
3
7 3 5
8 4
5 6 8 9 3
1
4 3 1
5 9 6 1 7
8 2 4 6
Hard #2
4 1 3 5
2 4
6 3
9 2 1 3
4 8 9 6 5
5 6 4 2
7
2 8
3 4 5 6 1
Hard #3
7 9 3
6 3 5 8 2
8 3
2 4 5 1
7 2 9 3
1 9 2 6
1 8 6
7 1 9
5
Hard #4
2 6 8
3 7 6
4 8 9 2
2 4 9 3 7
9 1 6
3 1 8 4 5
6 9 2
8 7 6
Hard #5
3 8 1 4 7
9 5 3
6 5 1
4 5 6
9 6 3 7 2
6 5
4 1
2 5
1 4 7 6
Hard #6
5
7 4 1 5
6 7 9
4 8
6 5 7 4
8 4 1 2
8 4 5 1
2 3 9
7 1 8 9
Hard #7
9 6
9 5 7 4 1
6 4 3
4
8 2 1 4
7 9 6
5 6 2 9
1 6
1 8 3 5 2
Hard #8
5 2 1
6 2 9 8 7
1 8 3
9
8 7 5 3
2 6 4
7 9
8 6 4 1
6 8 1 7

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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