World 7 (Super Mario Bros. 2)

World 7 is the seventh and final world in the game Super Mario Brothers 2 and all its other versions. Taking place in the clouds and sky, it features only two levels, unlike all other worlds, which feature 3. At the end of level 7-1, you fight green Birdo. 7-2, the final stage in the game, takes place in a massive fortress belonging to Wart, the evil frog king. The longest and hardest level in the game, it features multiple fights against Birdo, and at the end, the Hawkmouth comes to life and attacks the player before allowing advance to the final room, where Wart is fought. He must be defeated by throwing vegetables into his open mouth that come from a conveniantly-placed vegetable machine in the room. Once defeated, the good inhabitants of Subcon can be freed.