Printable Hard Sudoku

Set 31ewvi. 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 8 4 7
7 4 2
9 2
1 5
4 9 7 8 6 3
9 3 6 1 7
3 4
1 7
7 8 5
Hard #2
5 3 8 4
4 2
7 9 4
4 8
9 1 2 3
8 6 3 5
3 6 4
5 8 2 3
2 1 6
Hard #3
1 6 4 9 3
7 9
2 6 3 5
8 1 2
2 7 6
1 4
9 5 3 8 4 1 7
1 9 5
Hard #4
3 4 6
3 5 9
9 8
4 5 3 8 7
7 1 2 9 4
9
3 5 9 7 8
8 6 2
2 1
Hard #5
3 8
8 2
3 9 1 7 5
4 2 6
8 2 9 7
1 3
7 6
9 7 1 3
2 6 4 9 5
Hard #6
9 5 4 3
7 2
3 2
6 4 9 3 5 7
5 2 8
5 1
2 4 9 1 7 3
3 8 6
6
Hard #7
4
6 2 4
9 1 8 5 6
2 1
3 4 7 2 9
5 8 3
2 9 5 8 3
1 3
9 1 5
Hard #8
1 5
2 7 4 8
6 4 9 1
5 4 3
1 3 2 6
2 4 3 5
8 9 3 5
5 4 2
2

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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