Thank you for your responses. Found this video. All credit to original poster. (
). When defeated, Mother brain sort of disintegrates as it falls through the floor. Once completely through the floor, at 38:40 in the video, Mother Brain icon appears seeming to indicate MB is below the floor. If MB appears latter in the game, wondering if something could be done to destroy it here once & for all so it doesn't reappear. TIA for any further thoughts.
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