Ninja Surprise

"This strange crate has "Contains Ninjas" written on its side. Perhaps it may prove of use against the Bloon swarms."

The Ninja Surprise is a Special Agent of a similar nature to the Super Monkey Storm. It costs 40 Monkey Money to purchase. The Surprise appears as a simple wooden crate, with illegible scribbles on one side.

the Ninja Surprise works by being dropped onto the map in a spot chosen by the player. After landing, the box will burst open and a cloud of smoke (with the occasional Ninja Monkey being visible) obscures a 120-pixel diameter area around where the Surprise was dropped for three seconds. All regular Bloons that enter the smoke cloud will be popped fully. MOAB-Class Bloons are unaffected.

Ninja Surprise Pro
"The latest batch of crates is a lot larger, and has "More Ninjas" written on their sides. The Bloons definitely won't like these."

Upon the purchase of fifty Ninja Surprises (for a total expense of 2000 Monkey Money), the Ninja Surprise Pro is unlocked and replaces any regular Ninja Surprises in the player's inventory. The Ninja Surprise Pro now affects MOAB-Class Bloons, by slowing them down when they enter the cloud. The smoke cloud also lasts for two additional seconds, for a total of five seconds.

The appearance of the Surprise also changes slightly, with a larger crate and the smoke cloud having a darker tinge to it.