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 100% Walkthrough Part 4 - World 4 - YouTube | Super mario bros, Super mario, Mario bros New Super Mario Bros Wii 100% Walkthrough Part 4 - World 4 - YouTube | Super mario bros, Super mario, Mario bros](https://i.pinimg.com/564x/ae/ca/7c/aeca7c496045e4171292a9495b8e800b.jpg)
New Super Mario Bros Wii 100% Walkthrough Part 4 - World 4 - YouTube | Super mario bros, Super mario, Mario bros
![Stream World 4- Beach Land - New Super Mario Bros. Wii by 赤Spryzen Edits | Listen online for free on SoundCloud Stream World 4- Beach Land - New Super Mario Bros. Wii by 赤Spryzen Edits | Listen online for free on SoundCloud](https://i1.sndcdn.com/artworks-000161863193-4gfq6r-t500x500.jpg)