World 2 (New Super Mario Bros.)

World 2 is the second world in the game New Super Mario Bros. It is a large Desert-themed world, with enemies such as Pokeys and Lakitus. Bowser Jr. is fought here for the second time in the Tower, and the boss of this world is Mummipokey. This world introduces the idea of Warp Pipes - a means of transportation from one level to another. Unlocking Warp Pipes means that the player can skip some levels, and complete the world without completing all the levels.

If the player beats Mummipokey while in mini form, the player will gain access to World 4, instead of just going to World 3.

Enemies introduced

 * Pokeys
 * Lakitus
 * Spinies
 * Swoopers
 * Blockhoppers
 * Spike Bass
 * Hammer Bros.
 * Bullet Bills
 * Fire Snakes
 * Bill Blasters
 * Spiked Balls
 * Giant Spiked Balls
 * Big Piranha Plants
 * Boomerang Bros.
 * Fire Piranha Plants

Trivia

 * This is one of only two worlds in New Super Mario Bros. that allows access to two different worlds after the boss battle; the other is World 5.
 * The Castle in this World is one of the only three castles that partially take place outdoors (the other two being World 6 and World 7, where the boss battles take place outside).