There Can Be Only One



"Defeat Bloons Circles on Hard using at most one of each different tower type."

- Official Description

There Can Be Only One is a Special Mission in BTD5. It is unlocked at Rank 20 and rewards $250 Monkey Money and 20 Awesome Points when completed.

Trivia

 * The maximum number of towers (not counting agents) you can have on screen at the same time is 16, unless you put a portable lake. This is due to the lack of water for Monkey Buccaneers.
 * You can play this Special Mission on Freeplay Mode.
 * Though this mission is harder than just beating the track on hard, there is a lesser Monkey Money reward.