Printable Hard Sudoku

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

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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