World 3 (Super Mario Bros. 2)

World 3 (known as Chapter 3 in Yume Kōjō: Doki Doki Panic) is the third world of Super Mario Bros. 2. Like World 1, it is a grass land (though with a greater emphasis on secondary features, like a large waterfall, underground tunnels and a labyrinthine castle). The original world boss was Mouser, but in Super Mario Advance, he was replaced by Robirdo.

Bio for World 3-1
"''Surprise, surprise! In this world, you'll come across a huge waterfall. Do you dare brave enough a climb to the top? Consider this. If you drop down to the bottom-carefully-you can enter a secret room at the very bottom."

Bio for World 3-2
"''Welcome to World 3-2. Here, the only way out to get to Map 3 is by going up and down the ladders between Map 1 and 2. Watch out for sneak attacks and make plenty of headway by blasting off your bombs, where necessary."

Bio for World 3-3
"''Here, you'll find a whole bunch of rectangular rooms. You'll have to go up and then travel down to get inside. But stay sharp because you're is going to meet up with lots of Sparks. Watch your step at the very end. Mouser is waiting for you!"

Mondo 3 (Super Mario Bros. 2)