World 1 (Super Mario Bros.: The Lost Levels)

World 1 is the first world found in Super Mario Bros.: The Lost Levels. The world is well-known for bearing many similarities to the original game's first world, but the sprites have been advanced, and the levels are much harder. This was the first world in any game to introduce the Poison Mushroom.

Level Maps
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Trivia
.The only enemy in World 1-4 is a Koopa Troopa