World 1 (Super Mario Bros. 2)

World 1 in Super Mario Bros. 2 was the first area Mario, Luigi, Peach, and Toad ventured through. It was divided into three levels. As they traveled, the heroes were attacked by Tweeters, Shy Guys, Snifits, and Pidgits. At the ends of the first two levels, they had to face the egg-spitting Birdo, and at the end of the last level, they had to fight Mouser.

World 1-2

 * The first one is under the level when the player gets on the Magic Carpet.
 * The next one is at the top somewhat directly under the first one.
 * The third one is in a cave, a Key is needed to open it.
 * This coin is seen when getting out of the cave and going left.
 * This coin is seen by the last door.

Trivia

 * In the GBA Version, World 1-1 got the most changes of all the levels in World 1.