Printable Hard Sudoku

Set ey0ipo. 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 7 5 8
2 6 4
9 5 6 3 7
9 4 6
1 2 7
3 5 9
8 1 3
3 5 1
8 5
Hard #2
2 1 3
4 7 2
8 4 9 5
3 8 1 9 4
1 2 7 3
6 5
8 4 5
7 4 1
6 7
Hard #3
8 6 2 7
1 2 3 5 9 4
9 2 5 1 3
3 7
2 7 1 5 3
6 1
4 6
1 9
2
Hard #4
3 6
1
2 5 1 8
9 1 3
4 2 7 5
3 6 4 1
7 8 6 9
6 3 9 4
2 3 1
Hard #5
7 4 9 5
4 9
6 5 7 8
8 7 6
3 4
5 9 1 4 3 2
2 9
6 8 1 3
4 3
Hard #6
5
1 6
9 1 2 8 7
1 4 9 6 5
6 3 1
6 4
3 8
7 5 4 3 1 9
6 2 7
Hard #7
2 7 4
2 3
3 8 1 7
6 3 1 7
4 9 8
9 5 1 2
4 9 5
6 3 1 4 9
5
Hard #8
4 8
3 7 5 4
4 6 3 2 7 9 5
6
3 1 2 8
7 6 5 3
6 8 7 2
2 3
1

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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