Printable Hard Sudoku

Set 1uglq6. 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
3 6
3 1 8
8 2 6 4
1 5 2
4 7 6
4 9
6 9 4 3
9 1 8
3 7 1 2 4
Hard #2
8 9 6 3 7 4
6 5
2 5 1
6
2 3
3 9 7 6 4
7 4 3
2 9 7 4 6
2 9
Hard #3
6 1 4
4 2 1
1 5 4 2 6 7
4 8
1 6
9 8 7 6 1
4 2
6 7 3
3 7 9
Hard #4
6 2 1 9
6 1 5 8 3
6 4 7
7 8
3 1 5 2
1 9 5 6
3 6 2 5
4 3 8
Hard #5
6 8 4 2
4
2 8 7
3 1 8 2 6
5 1 3
4 5 9 8
8 2 7
7 5 6 1 4
8
Hard #6
8 9 2 7
3 1 6
4 3
2 5 3
3 9 2 6
6 5 2
3 9
8 1 9
1 5 7 6 8
Hard #7
5 3
9 1 4
6 2 5 3
8 2 3
1
7 8 3 9 4 5
8 2
4 8 5 1
3 7 5 9
Hard #8
5 4 2
1 5
9 7 8 4 3
1 9 8
3 7 9 5
7 4
3 8 5
4 9 1 6
5 9 7

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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