World 2 (Super Mario Bros.)

World 2 is the second world found in Super Mario Bros. The difficulty for this world is slightly higher than that of World 1. This is the first world to introduce an underwater level, as well as a seaside level.

Enemies introduced

 * Cheep Cheep
 * Blooper
 * Lava Bubble

Level maps
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Trivia

 * In Super Paper Mario, Floro Caverns reuses World 2-1 in it's main area of navigation in Chapter 5-3.