Printable Hard Sudoku

Set 1ffwle0. 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
7 1 6 8
2 4 5 3
5 9
9 3 6 5 2
3
5 4 1 7
2 9 1
6 7 4
9 4 8
Hard #2
9 4 8
4 1 5 9 7
8 6 4
7 1 6
5 2 3
4 1 3 9
2 4
6 9 5
6 8 2
Hard #3
3 4 9
8 6
6 4 5
9 8 4
7 6 9 1
2 3 7 8
1 4 2 8
5 9 7 6
1 3
Hard #4
9 8 7 5 2
5 9
7 4 9
9 3
6 5 1
1 7
2 1 9 3 8
8 4 7
1 6 2 9
Hard #5
9 4
6 4 9
7 5 2 8 3
8 5 3 9 6
6 2 8
2 6
2 5 3 4
7 1
1 4 5
Hard #6
3 4
2 5 1
5 7 2
4
8 5 7 1 6
8 7 4 9 3
9 1 7 3
5 8
7 4 8 9
Hard #7
4 6 3
5 2 4 9
8 7
5 3 8 7
6 3 2 8
5
9 7 6
2 1 8 5
4 6 5 1
Hard #8
2 7
4 8 6 3
4 3 9 8
5 8 9 1
7 1
3 6 8 4 5
2
6 2 5 3
2 3 9

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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