Just when you think it’s over, it’s not. I’ve only heard about this compilation recently, I have never seen it in stores when it was release. The game is not really rare per say, but it’s an usual sight anyway. The title says it all: it’s just a compilation of the first two games (but you only really want to play MKII anyway). Nothing is added, only a splash screen for the game selection, but something was removed: the two player versus mode. That’s not a big deal since two player mode on Game Boy generally requires two consoles, two copies of the same game and a link cable. And it’s not that common to have this setup up and ready. Except by being a collector.