World 6 (Super Mario Bros. 2)

World 6 is the sixth world in the game Super Mario Bros. 2. World 6 is a desert themed stage much like World 2. In the original game, the boss at the end was Tryclyde, who made it's appearance again from World 2, but in the Game Boy Advance remake, Super Mario Advance, it was replaced by Mouser, who is also the boss of World 1. Levels 6-1 and 6-2 feature Birdo's green form at the end, while 6-3 has red Birdo before Mouser/Tryclyde.

Level 6-2
Ride the Albatoss going right until you reach a platform that contains a magic potion, which will give you one coin and one mushroom. Then ride another Albatoss going to the left until you reach a third Albatoss that is above you and going back to the left. Ride that third Albatoss to the end of the screen.

Level 6-3
There is a short-cut at the very beginning of the level that will take you directly to Birdo. You will see a wall to your left with quicksand underneath it. Get up right next to the wall, and let yourself sink until just your head is above the quicksand while holding the button to go left. You should suddenly see your character start moving left. Keep holding left, and start jumping to avoid dying in the quicksand. You will pass under the wall to reach a door on the other side.

The enemies of level 6-3 include Tweeters, Bob-ombs, Ninjis, and a few Hoopsters; the environment is cave, desert, and sky. Before battling the boss of World 6, the player must defeat a red Birdo with a Mushroom Block and Birdo Eggs. After Birdo is defeated, the player will enter a fight with Tryclyde (Mouser in Super Mario Advance).