World 4-1 (Super Mario Bros. 2)

World 4-1 (Chapter 4-1 in Yume Kōjō: Doki Doki Panic; titled Enter the Ice World!! ) is the first level of World 4 in Super Mario Bros. 2.

Layout
The first part of the level consists of dodging Flurries while sliding on icy surfaces and jumping over pits. At the far right there is a plant that turns into a Rocket when pulled up, which takes the player to the next part of the level. World 4-1 is notable for being the only level in the entire game without a boss, instead it has a long area filled with many enemies, with the boss music playing in the background. The Crystal Ball is lying unguarded on the ground at the end.