Printable Hard Sudoku

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

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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