Shake King's Residence
From the Super Mario Wiki
Shake King's Residence is the final area in Wario Land: Shake It!. Wario battles the Shake King in a series of three battles here. Each battle takes place on a different level of the Shake King's Residence. The first battle takes places on the ground floor, the second is in the basement, and the third is underground. Each room the Shake King is fought in is narrow, giving Wario an advantage because the Shake King will often get stuck in the walls.