Printable Hard Sudoku

Set 319iem. 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
4 5 8 1
6 8 1 7 4
2
5 4 2 6
2 9
3 7 8
7 8 5
2 3 4 5
1 7 3
Hard #2
6 3 9
9 5 1 3 7 8
3 4 2
2 3 1
5
9 5
7 8 2 1 3 9
5 8 6 1 2
Hard #3
7 8 6
1 5 9
3 9 7 5
1 3 4 7
4 9
3 8 5
2 7 1 6
7 1
5 8 3 9
Hard #4
1 9 7 3
3 6 7 2 4
7 4
8 7 3 9
2 4 6 8 1
4 8
8 7 9 2 1
5 7
Hard #5
4 2 3 8
2 3 6 7 5
7 1 3 4
1 6 7
2 1
6 9 5
4 7 3
2 7
8 3 9
Hard #6
4
6 1 2 3
1 5 3 7
9 5 2 6
8 7 1
1 9 5 4
5 4 8 7 9 1
2 5 3
Hard #7
1 4 8
9 3
5 6 2
9 2 1 8 7
6 7 9
8 4 3
5 4 2
2 4 1 6
8 5 2
Hard #8
1 9 4 6
4 5 7 1
2
3 9 4 6
7 9 1
6 5 4
1 7 6 8 5
5
9 4 8 2

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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