World 9-6 (New Super Mario Bros. Wii)
From the Super Mario Wiki, the Mario encyclopedia
World 9-6 is the sixth level of World 9 in New Super Mario Bros. Wii. This level is a lava level, where platforms emerge and descend into the lava. Like all levels in World 9, there is no midway point. The only enemy type in the entire level is Flame Chomps, which can make the level a bit more difficult.
This level is a lava level with various Lava Geysers and Flame Chomps. Towards the beginning, Mario must jump over various rock pillars while avoiding the lava geysers. Later, there are moving lifts, including some that even dip into the lava, making timing crucial. Towards the end, there are more of these platforms, this time moving in more intricate paths.