Printable Hard Sudoku

Set 1f22q4t. 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
8 4 5 1 7
2 8 1 5
9 3
4 8 1
1 9 7 5 4
4
3 1
5 6 7
6 9 3 2
Hard #2
5 7 4 9 3 2
7 3 8 4 5 6
3 7
6 8
8 5
3 1 6 5
7 5 1
2 8 4
2
Hard #3
1 9 4 6
7 4
2 3 4
8 4
4 1 3 2
5 4 7 1 9
3 8 6 1
4 5
7 1 8
Hard #4
9 2 8
8 5 1
4 3 2
4 6 1
1 3 7
9 4 5
4
1 7 9 6
8 7 2 9 1 4
Hard #5
3 5 1 4 2 7
4 8 9
8 3 4
1 8 3
5 1 6 8 9
4
2 7 6 5
4 2
9 1
Hard #6
8 3 4 9
8 6
1 3
7 4 5 6
8 5 7 6 9
6 2 1
6 1 3 2
7 5
5 9 4
Hard #7
2 1 9 6
5 9 4 7
9 7 5
7 6 4 5 1
2
3 9
1 6 4
9 4 8 7 5
3 2
Hard #8
1 4
8 5 7 1 6
3 9 8 1
9 2 4
3 4 7
8 3 9
3 5 7
9 6
2 1 7 4

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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