New Super Luigi U: Frosted Glacier-3 -- Fire and Ice

To make your life difficult, there are Goombas in pine cones and Fire Bros that can release the Goombas with their fireballs. Go past them and you'll see Fire Piranhas. To the lower right of the first Fire Piranha is a gap with a pipe. Take the pipe underground, where you'll find an ice statue of Luigi and the first Star Coin. Return to the main level, and collect the coins from the Green Ring if you'd like. Ahead will be several Fire Piranhas on the ceiling. Wall jump up the gap for the hidden second Star Coin. Past the ceiling with the Fire Piranhas is a Fire Bro. Hit the P-Switch in front of it and drop down under the ice. Run under the Fire Bro to reach the third Star Coin. Ahead is a platform and a Fire Piranha in front of the flagpole. This opens the path to Frosted Glacier-4 and -5.