Printable Hard Sudoku

Set 1s0iyqm. 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
3 4 9
8 4 2
2 1 8 3
1 3
9 7 1 6
2 6 7
1 5 2 4
2 8 9 1
3 8
Hard #2
5 8 7
6 8 5 3 9
9 7 6
6 5 9
4 8 1 6
8 1
4 5 3
3 9 2
6 4 3
Hard #3
5 1
6 9 4 8
8 3 5 2
8 2 1 9
3 4 1 7
2
4 8 2 7 3
6 8 5
9 6
Hard #4
8 6 4
1 4 7
3 4 9
3 9 8 1 5
7 1 6
3
6 7 9 2
2 5 9 1
9 6 2
Hard #5
8
2 7 3 8 5
6 1
9 6 7 2 4
4 5 6
5 4 9
1 9 6 5 4 8
3
3 5 9
Hard #6
3 6
7 6 5
2 5 9
7 8
2 8 9
5 9 6 4 3
3 5 4 9 2 6
4 8 1
6 4
Hard #7
8 7
6 5 4 7
4 3
9 4 2 6 1
3 7
6 5 8 1
6 5 2
9 2 8
6 4 3 8
Hard #8
7 5
8 1 6
3 1 4 2 7
8 9 2
7 8
5 3 6 4
2 9
1 6 7 4 8 5
5 1

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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