Super Mario 3D World/Mystery House Melee

In Mystery Houses, you are presented with several timed challenges in succession. Each one awards a green star.

Star Challenges

 * Star 1: Defeat two Galoombas. Ground-pounds will take them out in one hit.
 * Star 2: Defeat two Koopas. Watch out for rebounding shells!
 * Star 3: Defeat two Cat Goombas. The left one will reward you with a bell.
 * Star 4: Defeat four Conkdors. Use the bell you got in the last room to swipe at thier heads when they peck.
 * Star 5: Defeat two Fire Brothers to clear the Mystery House.