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 Information
After defeating the False Bowser, the player will walk up to a Mushroom Retainer, who will say, "Thank you Mario! But our princess is in another castle!" The player will now have access to World 2-1.

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