Kingdom Rush Vengeance (Steam) Impossible Hero Challenge - Corridors of the Old City Iron

This iron challenge was so boring and tedious I had trouble staying awake while recording it.  It's maps like these that illustrate the slowed pace of the game that I talked about in my veteran walkthrough post.  Here's hoping we'll start getting to the good stuff soon.

Kingdom Rush Vengeance Impossible Hero Challenge - Corridors of the Old City Iron