Don't Fall In!

Don't Fall In! is a special mission in which a trapdoor opens in a random spot at the beginning of each round. If it opens within range of a tower (meaning the tower is at least mostly on it), the tower falls in and is destroyed. If it opens on the bloons' path (or anywhere else bloons are traveling), all non-MOAB-class bloons fall in. Each round, the trapdoor closes and reopens in a different random place. You must survive 50 rounds of this, and the trapdoor gets larger every 10 rounds. If you complete this mission, you get $300 Monkey Money.