Super Mario Bros. Wonder Gameplay Walkthrough Part 2- Petal Isles / Side World / 100% Petal Isles exist as a hub world in Super Mario Bros. Wonder and feature a selection of aquatic caves, beaches, and more that connect to all six Worlds, as well as forming a ring around Bowser's new castle which can only be attempted after completing all six other Worlds. There are 18 stages in Petal Isles. In addition to several main and side levels, the Petal Isles also features an Angler Poplin's House, as well as two Poplin Shops. 1. Leaping Smackerel 2. Angler Poplin’s House 3. Robbird Cove 4. Poplin Shop 5. Blewbird Roost 6. Downpour Uproar 7. Jewel-Block Cave 8. Poplin Shop 2 9. Petal Isles Flying Battleship 10. Gnawsher Lair 11. Maw-Maw Mouthful 12. Muncher Fields 13. Petal Meddle 14. Missile Meg Mayhem 15. High-Voltage Gauntlet 16. Evade the Seeker Bullet Bills! 17. KnuckleFest Bowser’s Blazing Beats The Final Battle! Bowser’s Rage Stage