Piston Monkey

The Piston Monkey is a fairly strange tower. It is a monkey holding a Piston from Minecraft. By default, it just pushes non-MOAB-class bloons back a ways, with no other effect. It costs $190 on Medium. It has the fire rate of a 0-0 Bomb Tower.

Increased Pressure
Description: Increased pressure inside the piston body makes it fire faster.

Cost: $120

The piston fires 30% faster.

High-Speed Piston
Description: Adapting the piston to make it fire at high speeds increases efficiency.

Cost: $715

The piston is twice as fast as a 0-x piston. It also pops 1 layer off of bloons when it pushes them away!

Sticky Piston
Description: Attaching slime to the end of a piston allows bloons to be held on to for longer, increasing poppage.

Cost: $1720

The piston can now hold up to 20 bloons on its end; attached bloons still loose a layer when hit at first. Bloons remain on the piston for 10 seconds, unless it's a Ceramic (or Ceramic-like bloon), in which it stays on for just 4 seconds.

Corrosive Slime
Description: Buying surplus from a glue factory enables this tower to passively pop attached bloons.

Cost: $9880

This upgrade mixes Bloon Liquefier glue with the ordinary slime. It can stick up to 50 bloons at once, including MOAB-class bloons (They count as 10 bloons), and it pops 3 layers off of bloons per second. Non-MOAB-class bloons, even Ceramic-class bloons, remain on this for 20 seconds. MOAB-class bloons remain on for a mere 8 seconds, but it's enough to make a difference.

Bigger Piston
Description: Increase in the size of the piston boosts range, area of effect, and pushing power!

Cost: $395

10% range boost, 20% AoE boost, and 15% push boost.

Stealth Piston
Description: Special ninja cloaking technology permits the piston to hit Camo Bloons.

Cost: $145

It can hit camos now. Woo.

Spiky Piston
Description: Attaching sharpened iron to the end of the piston lets it pop tons of bloons!

Cost: $8120

It pops 2 layers off of all bloons it hits. Stacks with upgrade 2 on the first path (That takes effect first, then this).

Spike Cannon
Description: The force of the piston pushing back releases the spikes, allowing even more poppage!

Cost: $8120

It regains the spikes on the next push. Releases spikes can pop through up to 100 bloons, but only pop 1 layer off of them.

Trivia

 * This tower has to have a Tier III specialty building to get an ability.
 * It references Minecraft and another tower; the Glue Gunner.