Printable Hard Sudoku

Set 147rma6. 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
1 3 5
9 1 8
1 8 9 7 4
2 4 9
4
1 5 3
2 9 1
5 9 7
5 6 1 7 3
Hard #2
7 2 5 4
8 2
8 1 6 3
6 1 9 8
3 1
1 5 6
5 1 9
2 3 5
2 7 4 3
Hard #3
3 2 6
2 1 8 6 7
4 7
7 6 9 3
9 2 1
8 5
5 3 8 2
9 3 5
8 9 1
Hard #4
8 5 4
3 4 5 7
7 9 3 8
4 3
7 2 8 9
5 9 1 6
5 1 4
7 9 5 2
3
Hard #5
5 1 8
9 8 6 3
2
8 4 9
9 6 7
6 5 2 3
7 6 8 5 2
9 7
5 4 8 2
Hard #6
3 8 5 9 7
6 3 7 2 8 4
8 1
7 1
9 8 2 6 4
5
7 9
5 3 1
6 7 2
Hard #7
2 6 4 1
7 5 9 2
9
4 8 6 7 9
5 8 4 1
6 3 4
6 4 3 5
3
5 7 8
Hard #8
1 8 5 2
4 1 2 9 7 5
9 5 6
3 2 1
3
8 9 6
5 9 3
6 4
6 2 5 9

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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