From the Super Mario Wiki
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The objective of the game is for the player to get their spaceship, which is in space, back to Earth. However, there are falling comets that will destroy the spaceship upon contact, so the player must be cautious. Two comets move slowly, one moves at normal speed, and about halfway, there are two very fast comets that fall. The spaceship slowly moves backwards when the player does nothing. If the player gets hit by a comet or is not back at Earth by the end of the microgame, they will lose, but if they make it back safely, they will win.