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

We do need towers this time, but still this is a trivial task for all our heroes.  I'm hopeful that maybe by the heroic or iron mode of the next map we'll have an actual challenge that needs grades, but for now it's all 'A's.

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