World 2 (Puzzle & Dragons: Super Mario Bros. Edition)
From the Super Mario Wiki
World 2 is the second world in Puzzle & Dragons: Super Mario Bros. Edition. This world takes place inside a cave with glowing purple platforms, pools of lava, Orbs scattered about the map, and a view outside the cave of what appears to be World 1 from New Super Mario Bros. Wii. It consists of nine levels and a Toad House. Lemmy Koopa is the boss of this world and is fought in his castle and airship. Unlike other worlds in this game, this world has no alternate paths. The world's theme is a remix of Slimy Spring Galaxy's background music from Super Mario Galaxy 2. Clearing World 2-1 unlocks the Skill Up spot at Toad Houses, and clearing World 2- unlocks Raccoon Mario and Fox Luigi as Leaders.
A more difficult version of World 2 exists as a Special World: ★World 2.