Sjudoku II - A greater challenge in the world where 9 is 7

Question

This is more difficult instance of a puzzle posted here.

Rules similar to Sudoku applies:

In each disk, the numbers 1,2,...7 should appear exactly once.
No line may contain duplicate digits (note that there are lines in 3 directions).

Solution is unique, and can be found by using classical sudoku-strategies.

This one also looks to be symmetric - are there any asymmetric solutions, I wonder? — Deusovi, Nov 14, 2020 at 22:39
What does asymmetric solutions mean in this context? I chose positions of hints in a symmetric manner, as this is common for sudokus. But note that the values are not symmetric — Per Alexandersson, Nov 14, 2020 at 22:45
I mean that it appears that rotating it 180 degrees and permuting the digits gives you the same puzzle. The solution is going to be symmetric up to permuting the 7 digits: every 3 will be opposite a 1, every 4 will be opposite a 5, every 6 will be opposite a 7. — Deusovi, Nov 14, 2020 at 22:48
(And the same is true of 60-degree rotations, not just 180-degree. The permutation isn't a simple digit swap, but it appears that we could create a consistent permutation that would work -- which leads me to question whether all solutions are the same, just with permuted digits.) — Deusovi, Nov 14, 2020 at 22:58
@Deusovi Given the solution of a single disc, there only three ways to fill all of the remaining discs. — Daniel Mathias, Nov 15, 2020 at 16:38

WhatsUp · Accepted Answer · 2020-11-15 00:34:45Z

2

Solution:

Steps:

I didn't find it very difficult. It's basically just normal Sudoku techniques.

However I don't really know how to describe my process...

Start with some obvious 2's.

This leads to the completion of all 2's.

Now we can fill in all the 4's and 5's.

The remaining is quite straightforward from this point.

answered Nov 15, 2020 at 0:34

WhatsUp

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