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.
Extract leading non-zero digit
Is my wife right? Now with even more wrong husband
Spot the outlier
Add two numbers
Is it really a 5?
Lights Out 4 - 5x5, 8 moves
Divisible by 10
Lights Out 3 - 5x5, 6 moves
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