I finally understood your problem. The problem description needs some adjustment. It is not clear that it is requesting only the global variable named 'z'. I thought it was referring to every global variable.
"global variable z" was explicitly mentioned in both the problem title and the problem description. Other than that, I trust that your comment and the Test Suite should be sufficient to remove any residual doubts.
The Goldbach Conjecture, Part 2
Distance walked 3D
pressure to dB?
Square Digits Number Chain Terminal Value (Inspired by Project Euler Problem 92)
Make your own Test Suite (part 3)
What score did they give?
The other half of the Fibonacci sequence
Comparison of floating-point numbers (singles)
Add all the numbers between two limits (inclusive)
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