Stormy Ascend

Stormy Ascend is a new special BG mod that is unlocked at Rank 47 after placing 110 towers in water, it is bought for 1280 MM. It makes the track rain (although it doesn't set the track status to rain), darkens the screen and creates random-sized ponds is random places of the screen (except on the bloons' path).

Trivia

 * The name of this mod is an obvious reference of the hardest level ever realeased in the Crash Bandicoot game series, Stormy Ascent.