Thanks for the feedback!
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For me all test cases were succesfull but validator 5 failed.
The issue was that I was not handling a case with the wrong tile at the end of the row correctly. Maybe this will help someone else one day 
You can send your code, I might try it and send back what’s wrong.
Thanks for your offer! Like I mentioned I was able to figure it out, apparently validator 5 has a wrong tile at the end of the row and there’s not case which has this. My code was not handling a wrong tile at the end of the row correctly.
I had some work to solve cases 6 and 7 but I finally did it, I loved this challenge!