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    About 10 minutes after posting this, I figured out the reasons why but it was late so I didn't reply. But for future people who are working on this issue and questions about those tests, your answers are invaluable.

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    Two of the paths I don't understand why they should fail:

    This one is apparently false for ambiguousness... but I am not clear from the instructions why:

     X-----+  
     X     |  
     |     |  
     |     |  
     +-----+  
    

    The second one is this and all the test says is that it is an edge case but it looks like it has only one legit path (well from each direction). Why is this one false?

      ++++     
     X++++     
         X     
    
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    This comment is hidden because it contains spoiler information about the solution