Regional Differences#
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US |
Japan |
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The Data East logo was removed, shifting the options upward. The Nintendo of America credit was replaced by one for Data East Corp., though the copyright date is still 1986.
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US |
Japan |
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Some of the music and sound effects use the FDS' wavetable channel in the Japanese version.
Unused Cheat Code#
The US release has an inaccessible cheat embedded in the code: While the title screen is scrolling up, if byte 0x4F is 00 and byte 0x52 is 0A, the player can press Up, Down, Left, Right, Down, Right, Up, Left, A, B to enable a counter which can be increased up to 99 by pressing A rapidly (entering the code sets byte 0x4F to FF, which then allows the next block of code to run). The counter resets as soon as a demo starts.
It is currently unknown what the counter is for, but could be a stage/difficulty selector. It is also currently unknown how to set byte 0x52 to 0A without hacking.