I tried to reproduce, but was unable to do so; all clues are non-zero. Did you use clues[i] to check your clues?

This is supposed to be coding practice though. It's like if the task was to sort a vector and you used R's built-in sort() function. Yeah... that works, but then what's the point? This is supposed to be a 6 kyu exercise, meaning it should take more than using a built-in function to accomplish.

I understand. I think there is a) not to reinvent the wheels, and b) write one's own code to show capability. Depending on the goals we may have different views, but I completely understand you.

This makes the problem trivial and is therefore not a good solution.

Exclude 1 please. I edit the third requirement just to have a clearer explanation. Thanks for the feedback. Hope that you can solve it.

Regarding the 3rd requirement: since every number is a multiple of 1, which is a perfect square, any number would meet this requirement? Or did you mean to exclude 1 here?

Good Kata! I had the mathematical details worked out but I don't know much C# grammar yet I want to make it work. I know my code may not look good/professional but I enjoy it~

I never solved PE 209 but seeing it mentioned here hopefully this is a hint :)

And I passed the C test with essentially the same code...
Hopefully someone can check the C++ random test generator

let's do the 6x6 then ;)

I am having a C++ random test with all clues being zero... Not sure what to do...