Watchtower

The Watchtower is a special agent appearing in my conception of BTD6. It is placed on the track, and stops bloons from moving. They will attack it to get through. Its like Road Spikes, but MUCH better. It can take 100 hits. Each type of bloon deals different damages. They are listed below. It costs 300 MM. Its Pro is unlocked after placing it 40 times(10,500 MM). It looks like a stone tower with a monkey in it.

Note: Each bloon attacks once per two seconds.

Red-Green Bloons: Not very powerful, and pretty wimpy when attacking, 1 damage.

Yellow-Pink Bloons: Swift at attacking, and larger, 3 damage.

Black-Orange: Smaller, but can really pack a punch due to their contents, 7 HP.

Magenta Bloons: The magic built up from their assaulter magicians deal damage, 12 HP.

Zebra, and Rainbow: Pretty big, and very strong, 10 HP.

Ceramics and Leads: Their hard shells really pack a whollop, 15 HP.

MOABs: Large, but some weaker damage compared to the other MOAB Class, 24 HP.

BFBs: Incredible strong, nearly ramming over the tower, 35 HP.

ZOMGs: Super powerful against the Watchtower with their ramming force, 48 HP.

IKOMs: Incredibly massive power destroys the tower immediately, 65 HP.

Pro
The Pro Version attacks bloons for half what they dealt. Example: Magenta attacks for 12, it loses 6 layers in return, decreasing damage. It changes to have spikes on it, and its HP is increased to 125, resulting in withstanding two blows from an IKOM.