From the Super Mario Wiki
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The entire level is made out of ice. After the second pipe is a row of Brick Blocks with Koopa Troopas on them and a ? Block with a power-up. And the end of this row of blocks are a group of Brick Blocks and Ice Blocks, with the right group being a tall pillar and a Buster Beetle behind it. In the group of four blocks to the left of the pillar is a Brick Block containing a Beanstalk to a Switch Block above, which will turn the pillar of blocks into a pillar of coins. After the pillar are some ? Blocks with one containing another power-up, and the area introduces Munchers and coins frozen in ice, which can be melted with fireballs. Next is a Para-Goomba and some more frozen coins and Munchers. To enter the Warp Pipe under the Munchers, the player needs to race over to this area after pressing the Switch Block from earlier and defrost the frozen coins: If done fast enough, the player will enter a secret area containing a Hammer Suit. After a gap with a Koopa Paratroopa is a row of frozen coins and Munchers, with Buster Beetles and Ice Blocks on top of them. After gaps with a Rotary Lift and a Koopa Troopa is the goal.