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The original Japanese version had voice acting for the entire game. The American version (with exceptions for the bosses and some cut scenes, which still have the Japanese voices) removed all of them to avoid confusion between translation dubs. This was fixed in the sequel, Mega Man ZX Advent.
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If you talk to a little girl "Sherry" in Area C-1 on your birthday, she will give you a piece of cake that heals 8 points of damage.
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This was the first Mega Man game to feature a playable female protagonist (Aile).
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After obtaining the Mysterious Rock, you can take it to Fleuve who will analyze and transform it into Spoiler:the Biometal Model O, allowing Vent or Aile to turn into Omega and use all of his attacks.
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