Quality as much as rarity forces up the Zanac price, but it is loved by shooter heads and pension planners everywhere. The original Famicom version is included and it stands up well to the ravages of time. The Playstation version has a very spic and very span make over with graphical pizzazz pouring out of the PS box of tricks in multiple parallax layers and clever graphical tricks. Three ships each respond differently to the power ups and there is real difference between the different shots requiring different skills to take down enemy clowns. Bravo.