Printable Hard Sudoku

Set 88x4ok. 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 6 8
4 5
8 1 9 2 6 3
3 1 4 2
1 7 8
1
3 9 5
9 8 6
2 6 4 8
Hard #2
2 1 7 6
1 8 3
3 2
9 4 1
7 8 4
7 6
7 1
6 2 8 9 3
4 6 3 8 2
Hard #3
1 4 9
9 5 4
6 2 7
1 7 4 8
8 2 1
9 5 6
3 6
9 3 2
3 4 7 8 9
Hard #4
4 1 3
2 8 7
6 7 4 5 9
7 9 5 1
4 8
5 1 7 4
6 5
5 4 2
2 3 9
Hard #5
7 9 1 2
9 7
3 4
2 6 1 9 7
1 3 4
7 5 9
1 9
7 2 9 1 6 8
6 4
Hard #6
1 3 9 2
7 1 4 5
2 4 7 8 9
1
7 1 5 2
8 6 5
7 1 5 8
9
3 9 2
Hard #7
2 1 9 6
4 3
9 7 5
1 5 6
7 4 1 2
3 4 6
1 7 8
9 5 3
6 2 8 4
Hard #8
4 7 3
9 2
5 4 7 9
7 4 2 3 8
2 3 5
1 8 7
9 5
5 8 2 4
6 1 2

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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