Printable Hard Sudoku

Set 1j05uzl. 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 4 9
6 9 3 8
3 2 5 4
6 2 8
9 3 6
4 3
7 2 8 5
8 1 3
9 3 4
Hard #2
3 6
2 8 4
7 8 9
9 6 3
8 1 7 2
7 3 1 4 9
1 6 4 5 2
4 9 2 8
Hard #3
4 7 8 6
8 7
3 4
7 5 1 9
9 3 8 6 2 1 7
6 5
5 7
2 9 3
9 6 1
Hard #4
2 4 1
9 4 8 2 6 7
6 4 8
3 4
7 2 9
1 9 7 6
8 1
3 7
8 5 1 6
Hard #5
3 8 1 6
6 5 2
2 3 9
7 6 3
4 1
5 9 7 1
5 1 9 7
4 3 9
6 5 2
Hard #6
3 1 2 4
5 8 6 3 9
7 4 9
6 5 1 8
7 1 4 2
3
9 7 2
2 5
4 9 5
Hard #7
3 7 8 6
5 6 2
4 7 1
2 5 7
8 9
7 2 8 5 6
9 2 6
1 6 9 7
4 2
Hard #8
6 3 9 5 4
5 3
5 4 8 6
1 8
7
9 2 5 7
8 5 4 3
7 4 2
3 7 1 9

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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