Plot
World 1: Mushroom Kingdom (Grassland)
World 2: Sarasaland (Desert/Mountain)
World 3: Tricky Toybox (Toybox/Food)
World 4: Coral Canyon (Water/Underground)
World 5: Mirror Mayhem (Shadow/Mirror)
World 6: Inferno Isle (Volcano/Castle)
World 7: Panic Planet (Space/Technology)
World 8: Starry Shrine (Light/Shrine)
World S: Bonus Bonanza (Anything)
Hub:
Peach's Castle isn't the hub this time! Just a part of it. The hub world is Toad Town. There are different areas for you to explore. Some areas contain Warp Doors that take you to levels. All the levels in a world are grouped together (Like the Mushroom Kingdom levels are by the town gates, and the Panic Planet Warp Doors are in the local lab.). Some parts are blocked off by Bowser's Shard Seals, which need Star Shards to break. There are also NPCs to talk to.
I havn't got any screenshots, but I'll add them eventually.