World 7-1 (Super Mario Bros. 2)
From the Super Mario Wiki, the Mario encyclopedia
The level begins with the player having to climb a ladder. They then must ride on the back of an Albatoss heading left. After jumping over multiple columns, the player will reach a plant, which, if plucked, will spawn a Rocket which will take the player to the next area in the level. From here, the player will have to dodge Snifits, Shyguys, Tweeters, and one Ninji to advance to the next area. This area involves climbing multiple ladders, dodging multiple Sparks, some Hoopsters, and another Snifit until reaching a door, which leads to the end of the level. Here the player fights Green Birdo. Much like in World 5-1, this Birdo appears gray in the original version due to palette limitations.