What world are you living in where this is difficult? It took me at most 5 minutes to solve this kata.

I disagree with you: why should a basic kata, which only handles multiples and simple exception cases, be classified as a 6 level?

One-line Kata)

Really great for learning how to calculate multplies, it's a great 'aha!' moment.

agreed

doubt yours is uglier than mine. haha

That is to give the ASCII-ART the trianglular space / representation. Surely, this is not the only ASCII-ART kata that expects leading spaces !

I disagree with this being 8kyu, this is more like 7-6ish. Plus the description lies to you about what will be tested.

pretty much the ugliest coding you can imagine, but got it to work in the end.

seem to have another instance of groovy random tests failing even though the actual tests pass

Random tests
assert sumMul(n, m) == sol(n, m)
       |      |  |  |  |   |  |
       |      53 |  |  |   53 721689
       618373112 |  |  4913340408
                 |  false
                 721689

yup!

Approved

python new test framework is required. updated in this fork

Your code fails for cases like n = 2, m = 2 whereby the correct answer is 0, but your code returns INVALID