World 5 (Super Mario Bros. 2)

World 5 is the fifth world in Super Mario Brothers 2, and all subsequent remakes, most notably Super Mario Advance. Like World 1 and World 3, it has a traditional grass-type theme, although some of World 5 takes place at night. This world introduces Birdo's green form, the hardest form of Birdo in the game because she fires only fireballs and must be defeated using other projectiles. In the original Doki Doki Panic, the boss was a repeat of Mouser, but for the SMB2 version, he was replaced with a new boss, Clawgrip the crab.