Printable Hard Sudoku

Set 1s0lsbm. 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 8
2 3
3 5 2
8 3 9 7 4
9 7 6
7 1 5
7 3 4 8
2 7 6
1 8 5 7
Hard #2
6 4 7 2
1 8 6
9 5 4
5 4 3 1
7 1 2 8
7 9
6 8 4 3
2 1 7
5 9
Hard #3
8 2 9
2 3
5 1 6 2 8
1
5 7 6
6 1 5 4 7
9 3
7 8 2 3 5
3 1 6
Hard #4
9 3 5 8
1 4 3 2
6 1 8 7
5 4 7
1 3 9 8
8
8 9 2
2 7 5 4 1
8
Hard #5
6 7 8 3
9 1
7 2 4 6
2 4 8 6
4 9
5 6 2 8
7 3 5 1 4
2 5
7 6
Hard #6
4 5 3 6
1 6 7 4
3 1
9 5
3 2 4 9 7 1
6 2 7
4 6 8
4 8 5
7 5
Hard #7
1 2 9
7 6 9 3
4 2
3 4 5
1 7 6
2 9
9 1 8
1 2 6 3 5 4
4 6 1
Hard #8
3 6
6 5 8 2 7 4
1 2 3
8 9 1 4
2 7 8
6 3 4 9 1
7
4 7
9 8 6

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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