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
![Nintendo of America on Twitter: "On this day in 2009, New Super Mario Bros. Wii was released for the Nintendo Wii! What are some of your favorite Mario memories? https://t.co/43FJyGIxyF" / Twitter Nintendo of America on Twitter: "On this day in 2009, New Super Mario Bros. Wii was released for the Nintendo Wii! What are some of your favorite Mario memories? https://t.co/43FJyGIxyF" / Twitter](https://pbs.twimg.com/media/EJTE01EU8AEtU_6.jpg)
Nintendo of America on Twitter: "On this day in 2009, New Super Mario Bros. Wii was released for the Nintendo Wii! What are some of your favorite Mario memories? https://t.co/43FJyGIxyF" / Twitter
![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)