never mind i figured it out
if you don't know how to do it grow then get the star from the bird (condor)
Go to the small picture on the left then look for klepto the condor when you find him punch him then look for the hazard switch then cross on the bricks and there is your star you can use any guy i used luigi.
you jump underneath it
dance
Groundstomp on it with the down button after you jump
You need 80 stars.
You beat the game
you have to beat 50cc
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You get a trophy.
Beat 150cc.
You have to beat bowser for the second time
you jump on him