Printable Hard Sudoku

Set 18mjs25. 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
8 6 3 4
6 1
8 1 5
3 2
9 1 4 6 3
5
9 3 7 6
7 9 6 8 1
4 1 9
Hard #2
7 9 6
2 6 5 8 7
8 9
1 4 3 6
5 4 7 9
6 7 9 5 4
7 1
9 8
2 4
Hard #3
4
6 3 7
9 6 5 1
2 1 4
7 8 2 5
5 6 9
1 8 3 9
2 6 4 5
6 4 1
Hard #4
1 3 8 2
4 3 9
7 8 4 3
1 5 8 3
4 3 5
6 2
6 5
8 3 4
4 7 6 2
Hard #5
8 2 6
6 1 3 9
9
8 2 7 1 6
1 6 5
4 7 8
9 4 5
4 9 2
3 8 1 9
Hard #6
2 7 6 9 8
7 1
4
5 8 6
8 4 3
5 2 1
3 1 5
1 3 8 7 4 2
4 6 9
Hard #7
7 3 6 2
4 5
1 9 5
3 9 4 5 6
8 7 4 9
7 3
4 8
2 6 5
8 1 2 6
Hard #8
7 6 9
4 7 3
5 2 4 6
6 8
2 6 8 1
5 2 3 1
1 2
9 5 4 6 3
9 5

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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