From the Super Mario Wiki, the Mario encyclopedia
The Coliseum Hallway is a location in Luigi's Mansion 3. It is on the first level of the sixth floor, Castle MacFrights. It connects the Cart Storage Room to the Coliseum. Near the end of the hallway is the entrance to the Royal Coffers.
The Coliseum Hallway is a narrow hallway that goes north from the Cart Storage Room then turns right to lead towards the Coliseum. In the middle of the first part of the hallway is a pressure plate that activates two axes to start swinging across the hallway. Luigi will need to avoid these to continue. Across the north wall of the second part of the hallway are banners with King MacFrights that Luigi can pull away with the Poltergust G-00. The first four banners all have money behind them. Behind the fifth and final banner is an archway. Luigi can use the Dark-Light Device to reveal the doorway to the Royal Coffers. Next to the door leading to the Coliseum is an armored knight that Luigi can destroy to reveal tons of money and three hearts.
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