Printable Hard Sudoku

Set i2nlye. 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 3 8 5
5 4 8
2 9
8 1 7 6 2
9 5 1 7
3 6
6 4 3 7
1 4 7
5 8
Hard #2
6 7
5 8 2
4 6 2
9 7 1 8
6 9
3 1 9
3 5 4 1
8 4 3
1 8 3 7 5
Hard #3
9 8 4 5 1
8 3 7
3 1 9 8
9 6
4
3 1 2 8
7 2 3
7 2 9 5
6 5 1
Hard #4
3 7
4 8 5
5 4 8 1 6
2 7
5 8 6
7 1 5 6 4
1 3 4 2 8
9 6 1
1
Hard #5
5 9 8 7
2 9 3 6
2 9 3
6 1
3 1 8 7
4 1 7 2
8
8 4 9
5 6 3 8
Hard #6
6 9 3
5 6 7 8
3 1 5 6
3 8 1 4
6 9 5
7 4
8 2
8 4 2 9 1
2 8
Hard #7
7 4 2 9 3 6
9 8 7
3 9
6 7 3 2 9
4
9 6 7 4
1 5
8 1 6
7 8 1
Hard #8
1
9 7 3 1 2
7 4 6 9
7 4
6 2 3
3 2 8 1 5 9
4 1 7
6 5 4
7 3

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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