go back to level 1. do the first level, and wait till your time is 199. Then jump. you
will get a big mario house. Get ur big mario in storage, then when u get 2 the last boss,
use ur big mario, and ground pound on him

if u do that, u will hav no backup if u go small and youl probably die unless your good at
the game.

easiest way- start the level as fire mario and make sure you have fire mario as backup as
well.

when you reach the bosses, if u still hav fire power, kill bowser jr with it. if you dont,
youl just hav to do it by throwing his koopa at him and them jump on him, keep doing it
until he dies

then, when bowser jr is dead, dodge bowsers blasts and then, he should jump- when he
jumps, run under him really fast and then jump on the button to end the level.