World 8-7 (New Super Mario Bros. Wii)
From the Super Mario Wiki
World 8-7 is the secret level in World 8 in New Super Mario Bros. Wii. This level features the Spine Coasters' first and only appearance, and is populated by several Lava Geysers. This course also has no enemies.
At the beginning of the level, Mario must jump on a Spine Coaster, which later leads to another Spine Coaster. The Spine coaster leads Mario to a Warp Pipe, which leads to the midway point and to another Spine Coaster. After three more Spine Coasters, the flagpole awaits at the end. The Spine Coasters often make risky maneuvers, passing through lava geysers and the lava itself.