From the Super Mario Wiki
Spooktastic World is a spooky/horror themed location acting as the second world in Wario World. The area is located inside a manor portal from Treasure Square. It contains a small castle, from where Wario has access to the haunted house known as Horror Manor, and next to it to the left is a circus tent that serves as an entrance to Wonky Circus. The swamp entrance on the right with giant green vines which lead to Dual Dragon's Showdown.
The world itself has an evening setting, complete with dried, leafless trees and sharp end fences. The world boss fought here is Dual Dragon. There are heart symbols on each end of the gate.
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