Printable Hard Sudoku

Set ls2e4k. 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
5 9 8 2 7
1 4 8
6 9 3 2
3 2 5 4
9 8 7
2
6 5
5 4 8 6
1 6 2
Hard #2
3 5 7 4 2
7 1 9
4 8 5
7 4 9
2 5
9 3
9 3 7 8
6 7 3
3 8 2 9
Hard #3
8 1
4 3 5 9 1
7 2 3 4
9 6
2 3
5 1 6 2 4
4 5 6 9
8 1
9 6 8
Hard #4
1 9
5 2 6 7
8 4 2
7 9 8 1
3 6 5 7
9 4 5 6
7 3 9
9 1
6 9 1
Hard #5
5
3 9
2 7 1 8 6
9 1 8 7 6 5 4
3 9 7
8 5 3 2
1 8
5 1 7
4 1
Hard #6
9 7 6 5
3 8 5
5 3 2
8 1 9
1 4 7 6
2 4
5 1 9 2 3
6 3 1
1 6
Hard #7
8 4 1
3 5 7
9 6 5 4
2 9 7 6
6 3 1
3 7 2 8
4 6
1 2 4
7 9 2
Hard #8
2 7 9
3 4 2 7
1 6
7 5
1 9 7 6
8 7 1
1 5
7 2 1 5 4
2 7 1 9

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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