Printable Hard Sudoku

Set 44ei5j. 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
4
2 3 9 6
1 8 4 3 2
9 4 1 3
5 1 8
6 5
7 8
7 9 3 5 1
8 2 5
Hard #2
3 4
2 3 5
7 2 1
4 3 9
1 9 7 8 6
9 6 2 4 1
5 9 1 8
6
1 7 6
Hard #3
8 9 4 6
9 8 3
6 2 3 8
3 2 7
2 6 3
9 5 7 6
6 2 9
1 4
8 1 5
Hard #4
7 8 6 1
8 5
6 9 4 5 8
4 1 8 2
4 8 3 7
1 9 4
1 6
9 1
8 5 4
Hard #5
3 1 5 9
9
9 5 8 4 1
8 9 1 5
1 6 7
7 4 2
9 6 8 3
1 6 8
2 5
Hard #6
9 1 6
7 1 5
3 4 8 7
5 4 2
3 9
6 8 3
5 4 2 9
9 3 8
8 6 1 2
Hard #7
1 8 9 2 4
3 6
2 7 8 1
3 1 2
5 4 2
6 7 4 5
2 4 9
6 4
9 5 3
Hard #8
5
5 4 3
3 9 2 5 6
2
7 4 5 6
6 5 8 3
3 4 7 2
2 6 9 8
3 1 2

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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