The test suite should check the size of the answer. It seems kind of a cheat to give an answer with 8 characters when the encrypted message has length 10. We can't be sure if the person found the asnwer for the two last characters or not.
And this problem is much easier than others you solved here!! ;-)
Sorry, I was tempted by the 'break the lock' part... :)
Return the 3n+1 sequence for n
Replace NaNs with the number that appears to its left in the row.
How to add?
Alternative Scoring. Create an incremental spiral.
Don't Try, give up and return NaN.
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