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 there is a circus that works as an entrance to Wonky Circus. The swamp entrance with a giant green vines which leads to Dual Dragon's Showdown.
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