In the beginning of the
level, you can choose how you'd like to get the red star:
Take your time slowly and get the mini-redstars, or do it
the fast way. When you reach the platform with the
Broomhatter, you'll find a series of holes that you can
launch yourself with. Afterwards, you'll land on a
platform with two red bumpers. Make sure these are red, or
jump to flip them so they are. Then, repeatedly knock into
the right one until Kirby becomes temporarily invincible.
Knock out the bumper and you can access the mysteriously
empty platform. Continue up the platform near the edge and
you'll trigger the red star to appear!