World 4-B (New Super Mario Bros. 2)
From the Super Mario Wiki
Mario begins on snow-covered land in front of a large wall and a blue Warp Pipe, taking him underground. He first drops onto several Ice Donut Blocks with several coins below. The floors are made of ice and thus are slippery. Amps are common in this level and many can be found following circular tracks. A ? Block with a Super Leaf can be found here, followed by a multi-coin Brick Block. More Amps follow. A lone Koopa Troopa can then be found on a platform with a single ? Block containing another Super Leaf. A Red Ring can then be found along with Ice Donut Blocks and more Amps. Immediately after is the Checkpoint Flag. A gentle ice slope can be found with several Koopas on it, followed by more Amps. Several blue pipes can be found, followed by one more set of circling Amps and the third Star Coin. This is followed by the pipe back to the overworld. In the last area of snow-covered floor, two rectangular Ice Donut Blocks can be found and finally the Goal Pole follows.