Printable Hard Sudoku

Set usb1a8. 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
1 7
8 3 5 1
1 2 8 5
6 2 9
6
7 9 5 6 4 3
2 6 5 9 4
1 7
2 3
Hard #2
5 4 6
6 9 2 7
4
3 7 4 9
4 5 8
6 8 4
8 4 2 1
9 3 5 7
6 1 8
Hard #3
5 9
8 7 3 1
3 9 8 2 4
6
7 3 4 1 5
5 8 2 7
5 6
1 5
9 4 5 7
Hard #4
7 3 8
3 4 6
8 4 5 2
4 2
8 1 2 9
2 1 8 4
4 7
6 1 7
1 5 2 4
Hard #5
5 2
3 5 1 8 7
7 1 6
7 5 1 6
3 1 4
1 7 8
1 8 9 3
5
2 7 4 8
Hard #6
4 3 1 5
8 5 9
7 3
9 1 4 6 3
5 1 7 2
7 6 8
6 2
3 9
5 6 2 4
Hard #7
9 1 8
6 2 7 1
9
9 6 8
7 4 8 9 6
2 4
1 6 3 5
3 4 9 1 7
6 8
Hard #8
9 8 5 1
7 3
5 6 2
9 4 3
1 8
6 7 4 9
3 2
9 8 1 6
8 5 7 4 1

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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