Printable Hard Sudoku

Set 1mwii9d. 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
3 1 7
6 4 5 3 2
2
4 9 5 8 1
8 1 9 7 4
2 1 3 9
9 8
8 4 6
Hard #2
8 4 2 5
6 9 3
2 6 1
1 3 4 2
4 5 9 2 3
3
3 7 9 2 5
7 1
5 6
Hard #3
1 6 4 9
5 7 3
7 1 4 8
5 8 9 4
2 4 3
8 5 6
9 5 8
2 6
7 4 1
Hard #4
8 7
2 5 4 9
9 8
5 1 8 7 9
9 7 3 1 4
4 2
8 1 5 4 3 6
7 2 1
Hard #5
5 6
6 2 7
7 8 3 1
6 1 4 7 8
2 3
5 1 9 2
7 1 4
9
4 3 2 8 5
Hard #6
4 2 1 3 6 9
6 8
9 3
7 5
1 4 8
3 2 6
4 7
2 5 3
1 8 3 5 2 6
Hard #7
4
5 3 6
7 5 3 1
4 2 3 5 8
3 1 6
9 7 3 4 2
2 9 5 8 3
1 4 2
Hard #8
2 5 7
8 5 9 1
9 1 8
5 9 8 3
2 9
2 3 7 5 6
4 5
7 2
1 6 7 9

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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