Printable Hard Sudoku

Set 4pdi5s. 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 1 7 9
7 5 4 1
3 9 5
3
6 5 7 3
3 8
8 4 1 2
1 5 7 9
3 7 6
Hard #2
7 6 1 8
8 3
4 6
2 1
8 4 2 3
9 7 6 4
4 9
3 2 1 4
1 7 9 5 6
Hard #3
6 1 7
2 3 5 1
1 5 2 8
9 3 6 2 1
5 8
8 4 9
2 7 5 4
7 4 6 3
Hard #4
1 4 5
2 5
7 6 1
8 7
2 9 3
4 6 2 1 7
5 3 2 8 1
1 9 3
8 5 6
Hard #5
8 6
3 5 4
5 2 3
4 8 2
4 1 7
7 5 9 1
1 9 6 5 3 2
9
7 3 2 1
Hard #6
8 1 2 9
8
6 4 3 2
9 7 8 1
4 1 9
5 3 2
2 9 6
7 1 4 2 9
3 4
Hard #7
2 5 1 7
9 4
9 5
4 5 1 2 3
8 3
6 8 2 4
6
1 7 6 3 2
7 5 6 8
Hard #8
8 7
3 1 4
2 1 9 3
8 7 4
5 2 7
4 6 5
3 6 1
4 2
6 4 1 5 2 8

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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