Printable Hard Sudoku

Set 1li5w98. 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 8 3 9
1 9 7 6 2
7
7 5
3 9
4 5 1 2
1 6 4 2
7 2 4 1 3 6
9
Hard #2
3 2
1
2 3 5 9 4
2 7 6 5
8 6 5 1 3
4 1
2 4
9 6 8 1 5
3 6 7
Hard #3
9 5 2 1
6 9 8
6 1 5 4 9
3 2
8 7 6 3
2
3 6 7 8
7 3 1 2
9 7
Hard #4
6 2 8 5
1 5 7
4 1 8
8 7 5 3 9
1 2 6 8 5
3 6 1
8
4 6
9 5 6
Hard #5
7 6 9 4
2 9
8 2 1 7 6
9 6 5
1
1 3 7 9
7 6 4 5
5 1 3
5 2 4
Hard #6
5 6 2 1
1 9 7 4
6 1 7
3
2 6
7 3 5 8 4
9 5 4 1
2 6 9
7 3 8
Hard #7
1 6 9
4 1 7 6 8 9
2 8
1 5 9
6 7 8
7 2 1 5
7 4 1 9 5
2 4
6
Hard #8
2 6 8
2 7 8 9
1 5 2
2 9
2 8
1 9 2 6 3
6 1 5
7 9 8 4
5 3 9

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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