World 3 is an ice world while World 4 is a water world in New Super Mario Bros Wii. In New Super Mario Bros U, why is World 3 the water world
![New Super Mario Bros Wii - Co-Op - Part 5 World 3-4, 3-5, 3-Boss | Super mario bros, Super mario, Mario bros New Super Mario Bros Wii - Co-Op - Part 5 World 3-4, 3-5, 3-Boss | Super mario bros, Super mario, Mario bros](https://i.pinimg.com/originals/a0/f0/1f/a0f01f6655de05f41159c0fbcb78f9df.jpg)
New Super Mario Bros Wii - Co-Op - Part 5 World 3-4, 3-5, 3-Boss | Super mario bros, Super mario, Mario bros
![New Super Mario Bros. Wii 100% Walkthrough Part 5 - World 3 (3-1, 3-2, 3-3, 3-T) All Star Coins - YouTube New Super Mario Bros. Wii 100% Walkthrough Part 5 - World 3 (3-1, 3-2, 3-3, 3-T) All Star Coins - YouTube](https://i.ytimg.com/vi/jO5YuyPXMvQ/maxresdefault.jpg)