Why are some test cases hidden?

Question

In Code Projects I write program, execute it, then check the output.
Unfortunately I find mistakes with some cases, but they are sometimes the hidden ones.

It takes pains to find out source code errors without the output.
What is the intention to hide them?

Any ideas are welcomed (^.^)
(Or can PRO users simply unlock them???)

Answer 1

They are hidden to prevent hardcoding of the solutions for the specific input values, hence they are hidden for non-Pro and Pro users alike.

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Answer 2

Such an idea never came to my mind because I am honest 😏

Thanks! Now the thread closing!