★World 2 (Puzzle & Dragons: Super Mario Bros. Edition)
From the Super Mario Wiki
Special World 2, known as ★World 2 in-game, is the second Special World in Puzzle & Dragons: Super Mario Bros. Edition, and is a more difficult version of World 2, with a green tint to the world itself. It consists of nine levels and a Toad House. Lemmy Koopa is the boss of this Special World and is fought in his castle and airship. Clearing ★World 2- unlocks Rosalina as a Helper; ★World 2- unlocks Lemmy as an ally, and Statue Luigi as a Leader.