While the idea of the game seemed easy, the game itself was anything but that. Due to its excellent challenge and originality it became a classic and merited a port to the NES and PC. To help the popular game grow they at Capcom turned it into a franchise spinning off many sequels to the original. While all the sequels were loved, the long time favourite was still the original. Now thanks to Capcom and Digital Eclipse we can play the original once again on Gameboy and Gameboy Color.