World 3-3 (Super Mario Bros. 2)

World 3-3 (Chapter 3-3 in Yume Kōjō: Doki Doki Panic; titled Huh? or Attack Dungeon!!! ) is the third level of World 3 in Super Mario Bros. 2.

Layout
World 3-3 starts in the underground with a door at the end. In the next room, there are a Shyguy riding an Ostro, Albatosses, Bob-Ombs, and another door. The next room has Ninjis and Sparks. The next door is located at the other side of the enemies. The next room is a tall room full of Sparks, and the player must scale to the top, where the next door is. The next room is another tall room, with Tweeters, Snifits, Shyguys, Pansers, and a Ninji, with the door at the bottom. The next room has Shyguys, along with the next door. The next door leads to the roof of the fortress full of Ninjis. The Crystal Ball is at the end. Located in the lair is the second Mouser battle (or Robirdo in Super Mario Advance).

This level is notable for containing the only red Snifit in the game, standing on a ledge.

Ace Coin locations in Super Mario Advance

 * The first coin is above the ledge before the door.
 * The second coin is on the topmost point in the door right next to the locked door.
 * The third coin is under the fourth platform and next to the third platform that make a zig-zag.
 * The fourth coin is right above the door that leads outside.
 * The last coin is up and to the right of Mask Gate.

Yoshi Egg locations in Super Mario Advance

 * The first egg is on the tallest post.
 * The second egg is on the platform with the Ninjis and Sparks. The Magical Potion is up the two ladders.

Trivia

 * This is the only level in the Super Mario All-Stars version to play the overworld music right before grabbing the Crystal Ball to enter the world's final boss.