Printable Hard Sudoku

Set 503ly8. 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 3 5
4 1 2
7 1 5
3 2 4
8 9 2 1
5
6 7 9 4
4 1 3
9 2 1 8 7
Hard #2
5 9 2 4
8 9 6
7 4 5 1
2 1 9
3
4 2 8 6
7 4 1
8 6 5 7
9 1 2
Hard #3
3 1 7 2
1 8 3
3 5
3 9 6 8
2 9 5
4 7
4 8
5 7 3 9 4
9 4 1 5
Hard #4
9 2 1
2 6 3 9
9 1 4 8 5
1 5 7 4 8
1 9 7
6 2
8 2 5 3
9 4 7
Hard #5
2 7 5 9
3 5 1 4
7
9 6 3
3 1 6
9 8 4 1
2 5
8 5 7
9 7 5 1 4
Hard #6
9 4 8
7 6 5 4
2 3
8 4 3
5 1 8 2 4
3 9 1
1
3 2 5
5 7 8 4 2
Hard #7
9 4 3
3 8 9
1 8 3 9 5 7
5 4 8
2 1 8
6 5 2 3
4 9 7
5 7
1 5
Hard #8
9 7 3
3 8 9 1
7 4 2
5 2
1 2 9
6 5 8 1
7 3
5 1 6
6 2 3 8 7

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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