Hm! Didn't think the order mattered. Now I know better! Fixed.

Actual and expected are swapped in random tests

I see that this has been done by someone else.

Thank you for the suggestion.

This looks very close to the answer, but the second half of the condition is only removing spaces and is therefore keeping unwanted characters like !, +, etc.

Just a wording suggestion, maybe change the description from "Your task is to extend the String class with a method called Score()" to "Your task is write an extension method for the String class called Score()" - just to avoid any misunderstanding that it is asking you to subclass String.

Sure, why not? Done!

add test case for empty string?

Heck, it doesn't even need to be what you would normally consider a pathfinding algorithm. All you're looking for is whether or not there -is- a path.

Doing an attempt runs all tests without stopping. If you time out on the last test, it still tells you the whole thing timed out.

Each \n marks the end of a row.

You are a gentleman and a scholar, suic.

Fixed

Fixed