This is absolutely clever but I think it can be hard to read. Also, I think you could have added constants so you don't end up with magic numbers that the next person won't know what they're for.

From C# 7.0 I guess

Did they add this recently? I can't seem to find any info about it.

Unnecesary System import ;-)

Fixed

Thanks :D !

The => is syntactical sugar that says thething to the right is the return value. The (char) is casting (changing the type of) the input variable integer into a char type.

Hi!, i come from Phyton and i'm new learning C#. I don't understand the "=>" and the (char)charcode; part xD. Can some one explain please :D ?

Nope, it's fine as is

A hint in the description for the maximum height of the tower would be nice.

Liking the use of a Dictionary!

C# tests missing.