This is the floppy disc version released in the USA by Big Five in 1984. It came in the same big box as the Atari 5200 version except with a Commodore 64 sticker stuck on the front. The sides even still said Atari 5200. A sticker was also added to the poster with additional instructions that applied to the C64 version. This is also the only release that included a cheat sheet. By the time the C64 version was ready for release, they must have realized just how difficult the game was.
There are also cassette and disk versions which were released in Europe by US Gold.