Printable Hard Sudoku

Set 1id8eyg. 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
7 1 5 2
5 6 9 2
8 4 6
7 4 9
9 7 6 2 4
3 5 7
1 5 7
1 8
2 6
Hard #2
1 5 3 6 8
1 4
2 8 7
3 4
9 7 8 1 3
2 9
1 8 3 7 9 6
5 4
6 2
Hard #3
7 3 1
8 1 7
2 3 8
4
3 6 7 5 2 9
2 7 3 6
8 7 2 1
9 8 4
4 2
Hard #4
9 4
3 6 7 1
1 8 9 3
1 3 4 7
3 5 9
7 6 1 3
8 4
6 7 2
2 1 5
Hard #5
1 8 5
4 5 6
5 6 9 4 2
3 8
6 4 2
6 5 9
4 7 5 3 9
7
9 6 2 8
Hard #6
8 4 1
7 2 5 6
3 5 4
7 8 1 5
2 3
3 1 6 2
5 3 7
6 9 2 4
1 7
Hard #7
2 3
5 9 1 7
6 3 8
1 2 5
5 7 1
2 3 6 7 8
4 8 3 2
2 9 7
3 7
Hard #8
6 4 1
3 4 7
5 7 8 3
8 3 6
7 2 5 9 1
4 2
9 5
1 3 8 4 9
1 2

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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