Printable Hard Sudoku

Set 1ubag8. 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 4 3 6
1
6 2 7
7 3 1 6 8
3 2 7
9 7 4
1 8 7 2
5 9 7 6
4 8
Hard #2
1 9 5
5 1 6
6 3 2 7
1 4 2 5 7
9 2 4
4 7
2 4 1 3
3 8 7
9 8
Hard #3
9 2 7 3
4 3 1 6
1 4
9 5 7 4 6
8 2
4 7 2 1
3 1 7 4
1
2 4 8
Hard #4
9 4
3 5 8 1 9
8 7
1 6 9 2
7 3
6 7 9 8
9 3 1 2
8 6 3 4
2 5
Hard #5
6 3 5 8 1
8 6 5
4 8 9
6 5 4 8
6 5
7 9 3
4 1 8
7 1 2
9 1 5
Hard #6
4 7 3 6
9 3
7 3 9 8
8 4 2 3
6 9 5
6 1 4
9 4 2
2 1 8
8 4 5
Hard #7
9
6 5
1 5 8 9 4
1 7 8
8 7 9
1 6 4
7 5 2 8
4 2 5 1
9 5 7 3
Hard #8
9 2
8 3 1 2
7 3 2 4 8
9 2 6 3 8
7
6 9
3 1
1 5 9 8
8 4 1 5

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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