joh_pot is correct. I noticed the same behavior. After completing the next kata, you are reward with points for the current kata and 'missing' points from previous kata.

Interesting, I solved this in Javascript and used a similar solution in Python, but can't get it to work.
Thank you for your help.

Thank you for explaining that distinction, it solved my problem.

On submit, the 14th test always fails. It is clear that the coordinates in the failure should return false. I copy and paste the string into the test case invalid section, and all tests pass. I believe there is a flaw with your 14th test. Please advise.

You may be giving away too much information in the description. I would suggest removing the information about how to determine if a number is a factor.

In Ruby, I just created a case/when for all of your test cases and returned the correct answer. You should add some random numbers in your tests.

There is still an issue with the class/test name mismatch. I changed the class name to match the tests, but you should change the defaults so they match. If a new comer to C# tries this Kata and is unable to troubleshoot, they may get discouraged.

This should not be a 4kyu, at most it should be 6kyu. If you do not expose the expectations in the tests, then it is a 6kyu, if you choose to expose them, this should be no more than a 7kyu.

Needs more test cases.
Description needs to use word 'null' instead of 'nil' for javascript.

You should add more tests to run.