Printable Hard Sudoku

Set in36yl. 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
6 7 1
1 6 3 8
8 9 7 1 5
7 6 9
8
3 9 1
4 2
1 2 5 9
9 3 4 7
Hard #2
6 2 8 9
5 7 1 4
1 4
8 9 4 6
3 6 5 4
2
1 9 7 5
9 1 2 8
4 8
Hard #3
7
4 3 8
5 1 8 2
3 9 7
1 2
9 6 8 5
6 4 2 9 3
5 1 2 6
1 5 7
Hard #4
7 2 1
6 3 7
4 2 1 6
7 5
7 9 2
2 7 5 3 8
3 2 8 7
6
2 4 5 6
Hard #5
9 3 2 4
3 4 9
8 1 2 4
3 7 1
8 9 5
9 8
1 5 6
7 4 2 6
4 7 5
Hard #6
1 3 9 8 6
9 3
7 3
8 7 3 2 9
7
6 5 8
9 6 4 1 5
1 8 9 2 3
1
Hard #7
5 8
2 1
4 7
7 6 4 5
4 8
6 5 9 1
4 8 6 1 9
9 1 5 2
1 9 7 4
Hard #8
9
1 5 2
6 5 4
4 8 9 6
2 6 9
5 6 3 4 1
7 6 8 2
8 4 1 7
2 5

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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