World 3 (Super Mario Bros.)

World 3 is the third world of Super Mario Bros.. World 3 is the first world in the game to be set at nighttime. This world also introduces the Hammer Bros.. This world consists of two ground levels, one level set at the heights, and one Castle.

Levelmaps
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Trivia

 * Though the world is set at night, no objects' colors are affected. As a result, in Hard Mode, the Buzzy Beetles are almost invisible.