Appearing in every game in the series since Brawl, I was happy to see Halberd return. It's from Kirby Super Star in a mini-game where Meta-Knight tries to use a ship to take over Dreamland.
While you start in a "basement" as I like to call it, soon you'll be in the open air.
And Meta-Knight's ship will shoot cannonballs at you, so be careful. Other than that, not much to worry about hazard wise.
Though it's not in my all-time favorites, I've had some good matches with this stage.