Printable Hard Sudoku

Set d8not4. 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 3
9 1 6 2
8 3 4 1
9 7 5 2 8
7 2 6 3
2 3 7
6 1 4
1 5 9
5
Hard #2
2 7 1 3
2 5 6
6 8
5 8 3
8 7 2 1 4
1 9 4 7
9 6 1 2
7
3 6 4
Hard #3
6 8 3 9 4
2 3
1 6 7
2 6 9
1 2 5 6
5 3 9
3 7 6 5
8 7
7 5 4
Hard #4
2 9 4 7
9 3 1
5 1 3 9
6 1
4 2 8
9 6 1
2 6 3
1 7 5 2 4
8 9
Hard #5
8 6
7 5 1 2
1 9 6
7 8 3
6 7 9 1
5
6 3 2
2 4 7 1
3 9 2 7 4
Hard #6
8 9 4
9 3 5 8
1 6
9 7 4 2 5
3 5 9 7
1 4 8 9 3
6 3 7
2 5 6
Hard #7
5 9
4 2 7 1
1 7 9 6
5 9 2
3 5
9 1 7
7 2 6 8 9
5 6 3
9 1 4
Hard #8
1 2
1 6 3 8
5 4 7
7 4
2 7
9 8 5 1
5 6 9 3
7 9 3 8
3 6 5 7

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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