Mario, on his way home from a trip, discovers that Bowser has been conducting a construction campaign of building high-rises in the Mushroom Kingdom, which are depriving the local plantlife of sunlight. Refusing to tolerate this, he brings out a mighty blue hammer from a chest inside his house and embarks on a mission to demolish the offending structures. Mario's old nemesis, Foreman Spike, along with several other foes from the original game, are out to stop him.

Mario, on his way home from a trip, discovers that Bowser has been conducting a construction campaign of building high-rises in the Mushroom Kingdom, which are depriving the local plantlife of sunlight. Refusing to tolerate this, he brings out a mighty blue hammer from a chest inside his house and embarks on a mission to demolish the offending structures. Mario's old nemesis, Foreman Spike, along with several other foes from the original game, are out to stop him.