World 6 (Super Mario World 2: Yoshi's Island)
From the Super Mario Wiki
World 6 (also known as the Koopa Kingdom) is the sixth and final world of Super Mario World 2: Yoshi's Island and its re-release Yoshi's Island: Super Mario Advance 3, resembling the landscape and environment of Yoshi's Island. The world contains eight normal levels. Its mini-boss is Tap-Tap the Red Nose; the main and final boss is Baby Bowser. This world includes many dangerous obstacles, including lava and spikes, the world's theme is a barren landscape in sunset/starry night sky. Its extra level is Extra 6: Ultimate Castle Challenge, its secret level is Secret 6: Endless World of Yoshis, and its bonus level is Bonus 6: Slot Machine.
List of levels
Names in other languages