Since the vast majority of recent problems are how to hack Cody, here's another one, with an even more malformed test suite than the original singularity.
Good luck hacking this one.
One interesting spin is: can you solve this problem using a freepass?
It will, but will the freepass work again if I rescore the solution? :-)
Now you're just showing off... :-P
Determine if a Given Number is a Triangle Number
Return the first and last character of a string
Convert a structure into a string
Highest powers in factorials
The Hills Are Alive...
Matrix of Multiplication Facts
Sums of Multiple Pairs of Triangular Numbers
Don't be mean. Be nice!
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