Roy's HardBrick Hotel
From the Super Mario Wiki
Roy's HardBrick Hotel was a hotel found in Hotel Mario, owned by Roy Koopa. The name is a pun on the Heartbreak Hotel, a fictional hotel mentioned in an Elvis Presley song that was later created. As it name implies, it was a hotel made full of bricks. Its lights were flickering at times due to the usage of electrity in the toaster room, where a cluster of toasters were toasting Bowser's Sourpuss Bread. Enemies found in there, were Ninjis, Bob-ombs, Para Bob-ombs and Goombas.