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 6-3
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).