World D

World D is the fifth and final secret world and the thirteenth and final world that was featured in the game Super Mario Bros.: The Lost Levels. Like the other secret worlds, it was left unused in Super Mario Bros. Deluxe. When Bowser is defeated at the end of World D-4, Princess Peach is saved, and, as such, Mario and Luigi beat the game.

Enemies

 * Hammer Bro
 * Green Paratroopa
 * Bill Blaster
 * Bullet Bill
 * Red Paratroopa
 * Green Koopa
 * Red Piranha Plant
 * Buzzy Beetle