Take the classic falling blocks theme, and mix it up with some BieberSoft attitude. That's what you have in PowerBlox, a collection of ten puzzles with a wide variety of themes and challenges. We all know the rules: Blocks will fall, and you have to situate them so that you clear horizontal rows. That's where things turn south. In PowerBlox, there are nine variations on this classic theme, along with the original PowerBlox Classic.