Printable Hard Sudoku

Set 146aal3. 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 4 1 9
1 5
5 3 7
6 2 1
9 7 8
1 7 3 6
6 4 3 5 1
9 3 8
7 4
Hard #2
1 9 4
5 7 6 3 8
1 3 6
3 4 7 1
3
4 2 5
8 1 2
1 5
4 2 6 9 3
Hard #3
3 5 7
8 7 4
7 3 5
9 5 6
7 1 9 2 8
4 1 9
6 8
9 2 7
6 9 4 3
Hard #4
6 8 2 9
7 1 4 3 5
6
6 2 3
8 4 5 7
9 7 1
3 7
2 6 3 8
5 2 1
Hard #5
2 6 5 4 1
1
5 4 9 8
5 7 2 3
7 3 4
3 9 6
4 8 5 6
3 1 9
1 9
Hard #6
5 9 1 8
6 8 9 7 1
1 2 6 5 9
2 6 4 3 5
7 2 8
1
9 5 3 4
9
3
Hard #7
5 4 7 9
7 4 3 9 8
6 4 2
6 3
2 1 9 7 4
2 1 7 5 3
5 2 9
8 5
Hard #8
5 8
9 2 8 1 3 5
4 7
8 2 6
4 7
9 2 7 8 5
5 1 7
6 3
9 5 8 4

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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