Space Junk Secret - Yoshi's Unexpected Appearance
From Lumapedia
Space Junk Secret - Yoshi's Unexpected Appearance is the secret star for Space Junk Galaxy. After feeding a Hungry Luma 50 star bits, the player must exterminate goombas from a Yoshi-head-shaped planet.
The individual level world records are 1:08.867 for Mario by Steakanator and 1:12 for Luigi by Flygonman.