Printable Hard Sudoku

Set 18mqir6. 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 5
5 3 8 6
7 4
2 8 3 5
3 6 5 7 9
1 7 8
6
9 3 8
2 1 9 5 4
Hard #2
8 4 9 3 1
3 5 2
8 9
5 8
6 1 7
9 2 7 3
2 4
7 1 9 2
3 9 5 8
Hard #3
2 8 4 6 7
6 4 2
5 4 2 7 3 9
1 7
8 3
5 4
4 9 2
6 3
7 5 4 6
Hard #4
7 8 4 9
4 7
5 9
2 7 6
1 6 2
8 7 5 9 3
3 7 9 5
1 4
4 5 2 3
Hard #5
1 2 9
6 8 9 1
9 2 7 4 8 6
2 7 1
3 1
2 4 3
3 1 2 8
7 3
5 9
Hard #6
9 6 2
5 9 1 3 8
9 8 2 4
4 7 6 8
1 3 7
9 6 4 5
4 5 7 1
8 4
Hard #7
4 6 3
8 7 9
8 5 2
2 3 4 8
9 4 8 6
1 5
6 2 7 5
4 7 6 5
9 1
Hard #8
3 7 5
1 9 6 7
3 9
1 2 8
7 2
3 5 4 1
3 7 2
5 7 4 8 1
9 8 5

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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