Please, instead of the input validations, present the available inputs into a constrained space.

This makes your description more readable, the code WAY more fun to write (instead of throwing boring exceptions because of the input)

I feel like the -1 on impossible is already more than plenty for this problem.

Otherwise, it's okay, the description is a bit wordy, and the performance is not tested, but for a 5 kyu problem that's also okay.

Please set the estimated rank to at a minimum a 3/4 kyu, (average is now 4/5 kyu) this is not a 1 kyu problem.

You really think these input validations have added value?

It's not. I'm effectively modifying the inputs which is then tested against your code. Because I've modified the inputs, I'm able to pass the random tests and hardcode the sample tests. There's also the function function labyrinth(...) in the starter code still (double function keyword).

If it's about invalid inputs, could you please perhaps check it now?

Not entirely fixed. We still have issues:
https://www.codewars.com/kata/reviews/68758c4e27434ab0b1f5d518/groups/687594793cfb3f47cf47c3b0

Can you check it now?

• missing random tests
• the function signature uses function twice