World 1 (Super Mario Bros. 2)

World 1 in Super Mario Bros 2 was (obviously) the first area Mario, Luigi, Peach, and Toad ventured through. It was made into 3 subsections. As they traveled, the heroes were attacked dy Tweeters, Shy Guys, Snifits, and Pidgits. At the end of the first 2 subsections they had to face the eggspitting Birdo. At the end of the last sub-section, they had to fight Mouser.