Printable Hard Sudoku

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

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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