Wendy's Blitz Snarlton Hotel
From the Super Mario Wiki
Wendy's Blitz Snarlton Hotel is a hotel found in Hotel Mario, owned by Wendy O. Koopa. It resembles a casino. Enemies found in there are Bellhop Goombas, Z Koopas, Mecha Koopas, Evil Coins and Rhinestone Goombas. After Wendy O. is defeated, the hotel vanishes, the Brothers made it out in time, but Princess Peach is taken away by Bowser.