★World 1 (Puzzle & Dragons: Super Mario Bros. Edition)
From the Super Mario Wiki
Special World 1, known as ★World 1 in-game, is the first Special World in Puzzle & Dragons: Super Mario Bros. Edition that is unlocked by clearing the game. It is a more difficult version of World 1, with a blue tint in the background. Like World 1, Larry Koopa is the boss of this Special World and is fought in his castle and airship. Clearing ★World 1- unlocks Larry as an ally, and Statue Mario as a Leader.
After fighting the second set of enemies, the player finds a branching path. To reach the secret exit, the player must clear more Wood Orbs than Fire Orbs. However, the course does not contain any Wood Orbs, so the player needs to bring an ally that can create Wood Orbs. Upon defeating the boss at the end of the secret path, the player unlocks ★World 1-5.