Same issue here as in your third problem. Please check the absolute value of the differences of the computed values with the correct ones. Otherwise, more silly answers (again, like this one :-) will slip through!
Thanks for the catch. I've updated the test suite to check against upper and lower bounds of each answer.
Maximum running product for a string of numbers
How long is the longest prime diagonal?
Maximum value in a matrix
Word Distance - Sum
Lights Out 1 - 5x5, 3 moves
Evened up (or not)
Musical Note Interval 1 - Diatonic Scale
Lights Out 14 - 5x5, four stages, x moves
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