World 1-3 (Super Mario Bros.)

World 1-3 is the third level of World 1 in Super Mario Bros.. It involves maneuvering on large mushrooms.

Layout
Through a small ground area, Mario will reach a giant mushroom that can be used to reach two more mushrooms, containing a Koopa Troopa and three coins. Ahead, three mushrooms are used by two Goombas. On the top of the third and taller mushroom, a shorter mushroom can be reached. There will be a platform that can help Mario to reach the top of a tall mushroom with four Coins. Under this tree, a shorter one contains the only Question Block of the level that contains a Super Mushroom or a Fire Flower, depending on Mario's form. There will be a short mushroom and a taller one, that is used to reach a tall mushroom that contains a Goomba. Between these two mushrooms, there's a Koopa Paratroopa. There will be two platforms that will go side to side. There will also be some Coins. There will be two mushrooms, the first one is small and of medium width, while the other is wide and tall. There will be a Koopa Troopa in the taller one. A short mushroom with three coins is under a Koopa Paratroopa. There will be two similar mushrooms that can be used to reach a platform. The platform can help Mario to reach a Block wall. The Flagpole will be after it.

Trivia
This level was recreated in World 5-3, with some elements added. The idea of a stage based on jumping across giant mushrooms would become a recurring trend in the series.