Printable Hard Sudoku

Set wp4nie. 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 1
1 8 2
4 7 8 9
4 5
6 1 4 8 3
9 8 2 6 3
3 5 4 6
2 6 7 4
Hard #2
1 2 8
8 3 9 1
3 6
9 2 7
4 5
1 5 2 8
4 9 5
7 6 1 9 4
3 8 1
Hard #3
1 6 3 7
2 4 1 3
7 9 2 8
1 9 8 7
3 1 5 4 9
4 3
4 9
6
8 7 3
Hard #4
7 9
8 3 6 7
2 9 6 3
1 5 2
6 1 9 5
2 8 3 4
7 9
9 8 5
3 5 2
Hard #5
9 6 4
5 2 1 8
4 3 6
7 4 9 5 8
5 7 2 4
4 5 6 1
7
2 9 1
1 4
Hard #6
8 4 1
9 5 8
6 4 3
4 8
9 2 3 1
1 6
6 1 3 4 5
3 8 2 6
7 6 8
Hard #7
7 9 1
1 4
5 2
6 5 2 9 4
1 3 2
8 9 7
4 3 7
2 9 8 1
1 9 5 6
Hard #8
5 7 9
8 4 1 3 2
3 2 1
6
9 1 4 7 5 3
9 4 7
2 8
5 3 9
3 6 8

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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