I dislike it when "submit" tests completely hide what is tested and then catch you by surprise as you muddle through failed special case after failed special case -- this often turns what seemed like straight-forward and simple problem into a drawn out and unncessarily complex experience.

Same. I've attempted several problems on here to find that I pass all the test cases but when I do the "submit" tests it fails. Just really frustrating and at a point I just move on from the kata.

Log
Low: 8, High: 97
Test Failed
Expected is <System.Int32[90]>, actual is <System.Int32[97]>
Values differ at index [90]
Extra: < 9604, 9801, 10000... >

why doesn't my statement work for the square function? It works for the samples fine but when I run the attempt it always gives an error.

var result = Enumerable.Range(start, end).Select(x => x * x).ToArray();

I came to the comments solely to make sense of the parameters given since they were so poorly written. Thanks for elaborating on them.