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.
Finding Perfect Squares
Implement a ROT13 cipher
Angle between two vectors
Find a subset that divides the vector into equal halves
Spot the outlier
Temperature Conversion Utility
Scrabble Scores - 6
Pattern Recognition 3 - Variable Unit and Array Length (including cell arrays)
Sphenic number sequence
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