World 4-Tower (New Super Mario Bros. Wii)
This tower features conveyor belts. Metallic blocks are found throughout the level, some of which are dropped by pipes. Some must be jumped on to advance, while others act as obstacles. These blocks may also crush players. Wendy O. Koopa is fought here, at the end. Wendy attacks Mario and co. by shooting rings that bounce off the walls (they eventually dissolve) out of her wand and jumping. She spins around in her shell attempting to hit the player when hit. After being hit the third time, Wendy is defeated.