Printable Hard Sudoku

Set 4ucqd7. 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 4 8
5 1 7
9 2 6
7 6
2 1 4 7
8 9 2 1
8 9
9 3 2 8 5
5 6 4
Hard #2
9
5 8 2 9
7 6
9 3 6 4 8
2 6 1
2 8 6 5 7
1 3 2
3 2 6
9 5 1
Hard #3
2 6
4
7 8 6 9 1
5 4 1 6
7 5 9
9 1 2 8 3
7 2
1 8 6
6 5 2 3
Hard #4
1 7 5 2
6 7 4
4 1 8 6
5 3 6
9 3 7 4
4 6
5 8 7
6 4 5 2
3 9
Hard #5
2 9
5 6
4 9 7 8 3
7 5 2
1 8 2 6 9
8 7 4 5
7 3 5
9 8 7 4
8
Hard #6
8 6 2
7 1
5 6 2 9
7 6 9 3 5
3 6 4
9 8 7 2 1
7 5 1 4
3
6 5
Hard #7
1 5 9 8
5 8 4 2 6 9
7 5
1 6 5 2
3 7 8 5
1 7
8 4 5
2 3
6 7
Hard #8
3 6 5
6 7 2 5 3
5 9 3 2
4 7
2 1 6
8 4 9
8 1 9 2
3 6 5
5 4

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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