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Depending on which Robot Master you defeat last, the following cutscene showing the memory of Spoiler:Dr. Wily convincing them to join him will be shown from different points of view, with the last Robot Master defeated being removed from the shot.
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There are portions of Endless Attack mode which re-use level designs from previous stages in the Mega Man series including:
•Wily Castle Stage 1 from Mega Man
•Wily Castle Stage 3, Heat Man's Stage, and Flash Man's Room from Mega Man 2
•Wave Man's Stage from Mega Man 5
•Wily Castle Stage 1 from Mega Man
•Wily Castle Stage 3, Heat Man's Stage, and Flash Man's Room from Mega Man 2
•Wave Man's Stage from Mega Man 5
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At one point, Mega Man 9 was going to be released on DS in addition to the Wii, But because the screen size of the DS is smaller than that of the Famicom, the idea was dropped.
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For some reason, the word 'Sigma' is censored if you enter it at the player naming screen.
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According to Capcom, there is a secret that no one has found in Mega Man 9. To this day, no one has any idea what the secret is, or if Capcom is telling the truth about it.
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According to the booklet of the Rockman 9 Arrange Album, Bass, known as Forte in Japan, was absent from the game because he was undergoing "adjustments" during the events of Mega Man 9.
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