World 5 is the fifth world of Super Mario Bros. World 5 introduces a new enemy, the Bullet Bill, along with the Turtle Cannon. This world features shorter time limits and harder levels. Levels, though, start to repeat from this world on, only with increased difficulty.
||The first level of World 5, this level introduces the Turtle Cannons and Bullet Bills.
||The second level of World 5, which has a Coin Heaven and an underwater sub-area.
||The third level of World 5, this level is similar to World 1-3, only with smaller moving platforms and Bullet Bills flying across the screen.
||The last level of World 5 is, as with previous worlds, a castle level. This level is similar to World 2-4, only it features more and longer Fire-Bars and additional Podoboos are in this level as well.