Printable Hard Sudoku

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

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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