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There are plenty of 1-Ups in this one last stage.
It's not really easy though, so this might take a little bit of practice.
So, get this Koopa Troopa over here.
Throw it, and just bump these Koopa Troopas on the bottom.
There.
And you also have to follow the Koopa Troopa otherwise it will just run away.
Just keep on following the shell and you'll keep on getting 1-Ups.
This is the hard part, so you have to make sure you bump this P-switch at the right time,
and you'll get these last ones.
And then after that just run down these.