You should never judge a book by its cover. This is not your average Marble-Popper game. I purchased this one back in July of 2011 when I was in search of a more challenging type than the ones available at the time (and still is, besides Luxor Evolved). There is something about the mechanics of Sparky vs. Glutters that separates it from all others in its category. It breaks you in gradually at first and then it releases the enemy at full-speed ahead. You have to remain determined to win or you don't stand a chance...definitely unique.