World 2-Tower (New Super Mario Bros. Wii)
From the Super Mario Wiki
World 2-Tower is the tower of World 2 in New Super Mario Bros. Wii and is the second tower in the game. This tower heavily features metallic fences that the player can cling on. As the player advances, purple fireballs come from above. They can be taken out with ice balls if the player has an Ice Flower. At the end of the tower, Roy Koopa is fought. This tower only feature Dry Bones as enemies.
The level starts with two doors, which lead to a room with a P Switch that make Blue Coins appear, and a metallic fence that Mario must use to get them. The entire level is based around the use of metallic fences to progress, while avoiding Dry Bones, spikes and purple fireballs launched from above by Roy Koopa. At the top of the first section is a door that leads to a midway point and the beginning of the second section. In a hidden area to the right of the last ? Block, is a Red Ring with another metallic fence. At the end of the level, Mario must battle Roy Koopa. During the fight, Roy attacks by jumping and ground pounding (Mario becomes stunned and vulnerable to Roy's attacks if he is on the ground when Roy lands). He then shoots fireballs out of his wand. Roy spins around in his shell trying to hit Mario when stomped on. He is defeated after being stomped on three times.