Wendy's Blitz Snarlton Hotel
From the Super Mario Wiki
Wendy's Blitz Snarlton Hotel is the sixth hotel found in Hotel Mario, owned by Wendy O. Koopa. The name is based off of the real-life Ritz-Carlton Hotel. It resembles a casino, and introduces a second screen for each stage - once all the doors are closed, an extra elevator at the top floor will take the player to the next half of the area. Enemies found in there are Bellhop Goombas, Z Koopas, Mecha Koopas, Rhinestone Goombas and "pennies". The boss stage is known as Wendy's Sweet Suite. After Wendy is defeated, the hotel vanishes. The Mario Brothers made it out in time, but Princess Toadstool is taken away by Bowser.