Printable Hard Sudoku

Set 1ugm5kw. 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
4 5 6 2
7 2
6 1 8
2 8 1 6
4 3 5 8
8 3
7 4
4 6 8 2
6 7 3 9
Hard #2
2
4 6
7 1 8 3 6
6 9 5
2 4 7 1
4 8 9
7 8
5 4 2 6 1
1 4 6 5
Hard #3
3 8 7 6 2
7 3 9 5
2 5
8 6
9 7 6 2 8
1 4
1 3 8
2 7
4 8 9 5
Hard #4
5 8 7 3 6
7 4 6 9 8
4
8 5 4
7 1 6 4
2 1
4 2 6 5 8
1 4
5 9
Hard #5
7 6 1
1 6 8 7
1 9
2 8 6 4 7
3 5 4 6
9 2
3 1 9
8 7 3 9
8 1
Hard #6
5 1 2 4 6
2 8 4 5
3 8 2
7 3 1 2
5 8
7 4
3 9
2 9 5 1
6 1 7
Hard #7
2 1 4 6 7
4 3 8 6
6 1 8 5
3 5 9 8
5 4 3
2 1
4 2 5
7 2
6 3
Hard #8
5 8 4 3
3 2 4
8 6
1 3 6
4 5 3 7
2 1 8 6
3
6 5 2
5 7 3 4 6

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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