Printable Hard Sudoku

Set 1i1pcf. 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 8 4 6
5 2
2 6 3 9
8 4 3
9
6 7 2
5 2 4
9 4 7 3
3 4 5 1 7
Hard #2
4 8 9
1 6 7
6 4 8
7 8 5 6
9 4 1
6 2
5 7 6 1
6 2 1 4 7
4 8
Hard #3
9 4
3 9 2
6 8
6 4 3 1 5 2 7
9 7 5 6
1 6 3 8
2 4 9
1 7 6 2
Hard #4
8 4
9 4 1 3 2 7
5 8
1 5 7 9
5 4 8 2
2 9
2 5 9
8 4 2
3 5 1
Hard #5
4 2
8 1 2 3
7 1 8 5
7 8 1
1 6 7
3 2 4
3 9 4
5 1 6 2
2 1 5
Hard #6
5 4
8 7 3 4 1
2 4 7 8
8 2 5
9 3 6
5 7 2
6 5 9 2
7
6 4 3 9
Hard #7
3 6 5 7
2 9 3 1
5 9
4 2 7
3 4
4 1 6
2 3 5 4
7 9 6 3
1 9 7
Hard #8
4 5 3 8
9 6 7 1
2 6
6 7 9 5 3
5 7
3 8 4
1 4
2 3 9
1 8 7 2

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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