World 4-2 (Super Mario Bros. 2)

World 4-2 is the second level of World 4 in Super Mario Bros. 2.

Layout
World 4-2 is the only level in the game that has Whales in it. The level starts underground, and has a vine that the player needs to climb to the first main part of the level. The player then needs to slide, duck, and jump along the ice while dodging a flock of Beezos. After going through a doorway, the next section has the whales in it. The water coming through the blowholes can hurt the player if the player hits it from the sides, but the player can stand on top of it.

This level also has a hidden warp to World 6. After the player enters the area with the whales, look for a magic potion. Carry it forward until there is a vase. Enter the vase after crossing over to the dream world, and the player will warp to World 6.