Printable Hard Sudoku

Set 9sq90l. 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 1 4
7 4 3
4 5
4 6 3 1 2
5 2 6 7 9
6 9 3
7 5 2 9 1
2 8 3
Hard #2
5 7 2
7 6 9 3
8 4
6 4 8 5 7
1
8 7 9 1 4
5 4 6 8
6 1 7
2 8
Hard #3
9 6 5 4
8 1
6 7 8 4
4 1 2
2 9 1 5 7
6 4
1 2 9
5 1 3 6
5 8
Hard #4
8 9 3
1 4 2 5
8
3 2 4 7 8
9 4 1 3
7 9 1 2 4
9 8 3
1 5
3 2
Hard #5
5
4 9 2 5 6
3
3 5 8 6 7 1
1 7 4 2 5 8
9 4 5
7
6 2
2 1 4 8
Hard #6
8 1 4 3 7
7 9 2 1
3 7 1
8 5 6 3
2 4
6 7 8
8 6 3
1 6 7 4
4
Hard #7
7 5 2
2 3 7
2 3
4 3 1
6 8 2 4
9 6 5
6 1
4 9 3 5
3 5 1 4 9
Hard #8
2 9 5 1 7
6 2 1
7 9
7 6 8
5 9 8 7 4
2 4 5
1 6 3
3 2 7 4
4

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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