U.F.O. Bloons

U.F.O. bloons appear on random rounds after round 25 in BTD6, usually only in twos or threes. These special bloons have 3 HP, but they have an AD of 3, making any attack that doesn't deal enough damage or pop enough layers useless! They come in three types: Green, Purple, and Blue.

All U.F.O.s

 * Space Piracy: If there is an item on the track in it's way, it will pick it up, making it impossible to collect until after the U.F.O. is destroyed! U.F.O.s can only pick up one item at a time.

Green U.F.O.s

 * Phase Warp: After taking one hit, it teleports to a new location somewhere between 2 and 5 centimetres away from its original position.

Purple U.F.O.s

 * Abduction: Abducts a random tower on the screen, keeping it inside the U.F.O. until it is destroyed. Basically, it's the same as Space Piracy, but it affects towers. :P

Blue U.F.O.s

 * E.M.P. Missile Shot: Fires a burst of three missiles that target random towers from anywhere on the screen and explode, dealing 3 damage each and stunning nearby mechanical towers! (Bionic Boomers and other Cyborg Monkeys will fire at 50% speed.)
 * Laser Blast: Rapidly fires bursts of ten lasers that deal 1 damage each. These are fired at a special wavelength that ignores damage reductions caused by the Shield Generator!

Trivia

 * Phase Warp and Laser Blast are obvious references.
 * Oh, and so is E.M.P. Missile Shot.
 * The U.F.O.s are similar to the bloons of the same name from Bloons Super Monkey 2.