• 2 prototypes exists. The earlier one, dated 1-5-83, has a number of differences, such as a different copyright date from the release (pictures #1 and #2), lack of options, and unlimited lives. Also, the game is much harder. If you get killed in the Gond zone, a bug occurs that causes the wrong enemies to appear in certain zones, and eventually crashes the game. The later one, dated 2-1-83, is similar to the earlier version, with a few other differences with the released version, such as an onscreen pause message (picture #3) that is missing in the final version (picture #4).
• The game was released with 2 different labels.
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