Printable Hard Sudoku

Set 1usoc79. 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 4 8 6
7 6 9 5 3
7
6 3
2 1 5 7 6
4 8 5
8
6 9 2
3 1 2 9 8
Hard #2
6 3 1
9 5 2
1 3 7
8 6
2 4 7
5 2 1 3
3 8 2 9
2 4 8
5 4 9 6
Hard #3
8 3 4 7 2
7 9
1 3 4 8
3 1
3 4 6 2 8 5 9
6 5
7 6
2 8
2 7 1
Hard #4
9 2 1
3 5
6 5 9 4
5 7 4
1 8 6 3
3 4 7
6 7 2 8 1
1 6 2
7 3
Hard #5
4 5 2 9
2 8 1
8 4 7 5
3 9 1
3 7 4
1 5 2
2 4
7 4 9 3 1
5 6
Hard #6
8 4 1 6 7
4 7 5
6 9 4
8 3
7 8 4 1
3 8 4 2
6
1 3
9 2 6 7 8
Hard #7
6 3 7
5 8
9 3 5
2 8 6
6 1
4 6 9 2 7
6 7 8
3 1 8 6 2 9
8 9
Hard #8
8 7
5 6 8 3
6 2
8 5
6 5 2 4
1 3 9 6 4
3 6 8
4 9 1
2 7 1 4

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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