The Twins' Room
From the Super Mario Wiki
The Twins' Room is small in size and filled with children's toys, such as trucks on the shelf, a helicopter mobile hanging from the ceiling, and a globe on a desk near the door. A pair of tennis rackets are in the corner next to a desk cluttered with books and a poster of the "Monsters" is on the wall. A Speedy Spirit is hiding in the bunk beds.
Ghosts in The Twins' Room during the blackout
Names in other languages