Printable Hard Sudoku

Set 19gib5z. 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 5 9
6 3 9 5 7
8 6 3
8 9 1 6
9 2 7 5 4
4 2
5 8 3 6
2 3 8
Hard #2
5 2 4 8
8 3 5
1 9 3
9
5 6 8 1
2 1 6 3
7 4 5
4 1 2 7
1 9 4
Hard #3
9 5 6
1 9
8 6 9 3 5
3 5 1 2
9 2 5
8 4 9
4 6 9
4 7
2 8 9 6
Hard #4
8 4
8 5 7
9 6 2
2 9 4 7
4 1 8 3 9
8
1 9 2
6 4 7 1 2 5
5 6
Hard #5
7 8
6 9 8 3
3 7 2 9
1 2 5
2 8 6
9 4 3 8
6 8 5 7
3 8 6
1 8
Hard #6
4 3 6 9 1
3 7
9 5
8 2 7 6
9 7 8 2
1 4 9
2 8
6 9 5 8
2 4 6
Hard #7
7 3 9
5 7
2 1 4 7 6
2
3 2 8 6 5
1 4 6
4 8 5 3 7
9
6 1 5 9
Hard #8
8
3 4 5 6
8
5 2 1 9 7
7 6 2
8 4 9 5
4 9 7
3 2 8 9
1 8 2 4

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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