Story

One day the kingdom of the peaceful mushroom people was invaded by the
Koopa, a tribe of turtles famous for their black magic. The quiet, peace-loving
Mushroom People were turned into mere stones, bricks and even field horse-
hair plants, and the Mushroom Kingdom fell into ruin.

The only one who can undo the magic spell on the Mushroom People and
returntthem to their normal selves is the Princess Toadstool, the daughter of
the Mushroom King. Unfortunately, she is presently in the hands of the great
Koopa turtle king.

Mario, the hero of this story (maybe) hears about the Mushroom People's
plight and sets out on a quest to free the Mushroom Princess from the evil
Koopa and restore the fallen kingdom of the Mushroom People.
You are Mario! It's up to you to save the Mushroom People from the black
magic of the Koopa!

(The storyline is getting from the instruction manual)