Printable Hard Sudoku

Set 165y6wr. 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
5 2 1 6 4
1 2 3
6 7
6 4 5 8
9 7
5 9 2 6 4
4 1 3 5 9
2 7 4
Hard #2
4 5
8 7 1 4
9 3
9 6
7 6 5 2 8
9
2 3 4
8 4 2 9
6 1 5 7 4 2
Hard #3
8 7 6
2 8 5
3 4 2 8
5 6 1
1 8 4 2
8 2
5 6 9
6 7 8
1 3 4 7
Hard #4
1 4
1 5 6 3 2 8
2 9 3 6
7 2 5 4 9
5 4
9 7 1
2 8
8 2 7
4 1
Hard #5
5 4 6 3
4 3 5 8
1 8
5 4 6
2 7
6 8 2 9
3 9
3 1 5 8
7 8 2 1
Hard #6
7 3 8 4
4 6 5
4 5 1
1 9 8 5
2 9 1 6
2
4 9 1 3 7
8 3 4
6 2
Hard #7
6 7 4 5 3
1 2 3 6 4
4 6 8
8 9
9 3 5 1
5 4 7
4 7 8
2 5 8
5
Hard #8
7 8 5 2
2 3 1 4
4 3 8
7 6 3 2
3 7 8 6
9 3
6 5 4
9 1 2
7 4

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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