Since the new, big thing for this game is the ability to leap from car to car, many people think that this is the easiest way to win the game. However, I have found that sometimes the easiest way to win a level (especially the Hard Balls boss battle) is to just blow cars up instead of taking the time to capture them. It gets you back to the boss or goal faster. This is not the only strategy, as you will want to get a new weapon / car, but this will get you through some of the tricky spots easily.