## 4-clue puzzle

For fans of Killer Sudoku, Samurai Sudoku and other variants

### 4-clue puzzle

Code: Select all
` . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 8 4 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2`

It seems unlikely, but this puzzle apparently has a unique solution, given the following three constraints:

1) X-sudoku;

2) central box is a magic square;

3) no digit can be repeated a knight's move away.

A video showing how to solve it is here.

Regards,

Mike

m_b_metcalf
2017 Supporter

Posts: 11454
Joined: 15 May 2006
Location: Berlin

### Re: 4-clue puzzle

Very nice and only basic methods needed.

Hajime

Posts: 280
Joined: 20 April 2018
Location: Netherlands

### Re: 4-clue puzzle

Hajime wrote:Very nice and only basic methods needed.

Indeed, but it took me a while to solve, manually. Hope I got the same solution:
Hidden Text: Show
Code: Select all
` 8 4 3 5 6 7 2 1 9 2 7 5 9 1 3 8 4 6 6 1 9 4 2 8 3 7 5 3 8 4 6 7 2 9 5 1 7 2 6 1 5 9 4 8 3 9 5 1 8 3 4 6 2 7 5 3 7 2 8 6 1 9 4 4 6 2 7 9 1 5 3 8 1 9 8 3 4 5 7 6 2`

Mike

m_b_metcalf
2017 Supporter

Posts: 11454
Joined: 15 May 2006
Location: Berlin