I'm Slidin' Down The Banister! is an expert track unlocked at rank 39. Land towers can be placed everywhere except the puddle, on the windows, and on the poles on the staircase. Water towers can be placed in the puddle made by a leak in the roof. Also, due to the fact that the track goes downwards, all bloons move 10% faster then normal on this track! It rewards 300 MM and 25 AP on Easy, 500 MM and 50 AP on Medium, and 800 MM and 100 AP on Hard.