World 9-5 (New Super Mario Bros. Wii)
From the Super Mario Wiki
World 9-5 is the fifth level of World 9 in New Super Mario Bros. Wii. Like all levels in World 9, there is no midway point. This level is an ice level where the player must get to the top of the icy mountain while avoiding Cooligans, Fuzzies, and Big Fuzzies.
Instead of the typical horizontal level, this level is vertical, and Mario must constantly jump to move upward through the level, similar to World 3-5. At the beginning of the level, Mario must hit a ? Switch that activates a platform which allows Mario to get onto the next platform. Towards the middle, there are various Fuzzies and Big Fuzzies riding tracks. At the end, Mario must jump on some Brick Blocks moving on tracks to reach the flagpole.