World 1 is the first world of New Super Mario Bros. 2. This takes place in the Mushroom Kingdom. The music is the same in the first world of New Super Mario Bros. Wii. The boss is Roy Koopa and the mid-boss is Reznor. The cannon here leads to World Mushroom.
- Before World 1-1: The Koopalings capture Princess Peach and fly off all around the Mushroom Kingdom. Roy Koopa takes Peach to the World Tower.
- After World 1-Tower: After defeating Roy's Reznors, Roy still has Princess Peach. Roy then takes her to the World Castle.
- After World 1-Castle: After defeating Roy himself, Mario is confronted by Iggy Koopa, Roy's younger brother. Iggy then takes Peach to the Desert.