Printable Hard Sudoku

Set 1ei9sk4. 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 8
3 7
6 9 7 1
3 9 4 5 1
5 2 3 6
7 8 4 3
6 2 1
4 5
2 1 6
Hard #2
2 1 4 6
4 8
2 3 1 5
6 3 1 8 9
8
1 9 6
6 8 2 3 4
8
7 4 6 2
Hard #3
8 6 5 9
2 8 6
1 3 5
5 8 4
4 8 2 1 7
1
2 3 5 9
3 6 9 4
7 8
Hard #4
6 3 1 2 8
5 9 7
7 3 4
2 8 7 5
9 6 8
4 5
9
5 2 3 1
1 8 2 5
Hard #5
9 5 6 2
2 8 4 9
7 9 8 6
1 8 3 9 4
2 5
9 8
9 1 3
2 1 6
5 3
Hard #6
2 1
6 8
1 5 4 2 8
8 6 2 9 7 4
2
9 1 3
4 3 1 5
3 8 9 4
7 8
Hard #7
9 8
7 6
2 9 6 5
3 6 7 1
5 2 4 6 9
6 7 2
4 2 1
3 8 5 9
8 3
Hard #8
6 7 2 4 1 8 5
6 5
1
5 3 4 7
7 6 3
6 9 7
3 4 9 1
8 5 2
9 7

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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