Printable Hard Sudoku

Set 18t0py7. 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 7
6 5 4 7
4 3
9 4 2 6 1
3 7
6 5 8 1
6 5 2
9 2 8
6 4 3 8
Hard #2
7 5
8 1 6
3 1 4 2 7
8 9 2
7 8
5 3 6 4
2 9
1 6 7 4 8 5
5 1
Hard #3
2 5 4
5
8 7 4 2 9 3
6 7 8 5
1 5 6
3 9 1
2 1
9 5 4
7 6 9 2
Hard #4
3 1
2 7
1 2 5
5 1 4
9 8 7
3 4 9
6 4 1 9 2 3
8 6 1 9 7
7 8
Hard #5
8 6 1 3 5
5 8 4
7 1 3 2
1 2 7
6 4 5
7 2 8
7 2 4
9 3 5
6 1
Hard #6
6 3 9
3 6 5 4
2 4 7
4 6 1 9 8
2 5 8
5 1 6
3 5 6
7 3 1 5
8
Hard #7
2 6 4 1 3
8 4
1 4 6 5
4 9
6 5 8 4
3 5 8
1 5 2
1 5 9
7 6 8
Hard #8
9 2 4 8
8 6 9
5 4 7
2 7 3 6
9 7 5
5 2 3
1 8 2
2 5 7
8 5 1

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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