The US version of Aquajack likely underwent some form of localization compared to its Japanese counterpart. These alterations might range from simple language translations to more significant changes in game elements to better appeal to the American market. More details about the developer and release dates are needed to offer more insight.  A direct comparison with the Japanese version would help highlight these variations and their significance.  Localization in games can offer fascinating insights into how game developers adapt their products for different cultures and preferences.

Aquajack (US)

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