Jump on a red box with a weird symbol on on it and take nozzle that comes out. You have obtained the rocket nozzle.
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Rocket Nozzle
It depends on how many shines you get. when you have enough shines shadow Mario will appear holding a rocket nozzle, turbo nozzle, or a Yoshi egg
you need to have enough shine sprites (or blue coins i don't know) but in super Mario 63 you can only make the rocket nozzle appear by getting the first key
you have to use the rocket pack.duhh!(if you unlocked it of course!)
I believe you need either 35 or 45. one of the two.