Round screens healthy variety gameplay. Not all the same ball for the rectangular field to chase.
To kill every boss need to use a specific tactic. This, for example, to turn upside down, changing the gravity.
Among the video game "Breakout" - an unexplained phenomenon. Since the last century, their gameplay has not changed one iota, but driven by the racket smashes the ball painted bricks with the same fervor that was 30 years ago. The secret is simple: being one of the founders of the current geymindustrii, "Breakout" are casual games that will please both fans of The Sims, and hardcore MMO-raiders.