enjoyable Kata.

I found the description a bit confusing with the instructions for different lanaguages all mixed together. Consider creating separate descriptions for each language.

This one captures the spirit of the kata well.

I like this more than the top voted solution. It's clear just from looking at it what's happening. Using a loop makes this more complicated than it needs to be.

The Details are confusing. The commands are presented first, but don't make sense without a definition of "current number" and a description of the stacks.

I guess my comment would have been more useful when this was in beta. It's too late now, but I'd remove the "max digit of n, sum of digits of n" part. It would take a while for a beginner to figure out the right algorithm, and they're likely to go away thinking that "Lua is hard".

I rated this as "somewhat" satisfied because the complexity of the solution obscures the lesson being taught and doesn't support the idea that "Lua is easy".

The Details tab lists Lesson 2 as "Numbers" and Lesson 3 as "Strings", when in fact Lesson 3 is "Numbers", and Lesson 4 is "Strings"

literally "throw error" will work.

I agree, you can't assume people using this site have taken a Calculus course.

Great kata.

absolutely. Codewars needs more C# specific content.

Please say in the description that Tree.Ouch must validate its input.

Great kata.