Since then, there have been dozens, maybe hundreds of incarnations of this most
simple concept: swarms of
units with varying attributes are traveling slowly down a twisting road to your base, and your sole defenses are the projectile - flinging towers that line the road (but, of
course, may never block it).
Our Phoenix Traffic School
course is convenient and
simple, and you can be working on the first
unit of study just minutes after registration.