The data for the American version of the GBA release suggests that a Japanese version for the game was planned. However, because the GBA was discontinued the previous year in that country, it was cancelled.
Contributed by GamerBen144
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A bunch of rather vulgar passwords can be found in the GBA version's files. All of the passwords (except for B1TCHK!) are six characters or less, compared to the seven character passwords used for the game. Using B1TCHK!, however, doesn't do anything, making this also unused.
Contributed by GamerBen144