Printable Hard Sudoku

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

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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