Thicker Foams

Thicker Foams gives each Cleansing Foam puddle 3 more pierce, so it can affect 3 more bloons before it disappears. A 0-3-0 Engineer's foam goes from 10 to 13 pierce, and with Oversize Nails (0-3-1 or 0-3-2) it goes from 15 to 18. It is a fourth-row Support knowledge: you need 3 points in Support and Vigilant Sentries, plus a one-time fee of 250 Monkey Money.

How it changes the game

Cleansing Foam is the Engineer Monkey's middle-path tier 3. It drops foam on the track that removes Camo and Regrow from bloons and lets the Engineer deal with Lead. Its weakness is pierce: on dense camo or regrow rounds, a puddle runs out before the whole group has passed, and the bloons behind it keep their properties.

Thicker Foams is a 30% pierce boost on a 0-3-0 foam, which makes the Engineer much more reliable as your main decamo and degrow source. The best way to use it depends on what you want from the foam:

• 2-3-0 for decamo and degrow. Faster Engineering makes the Engineer drop foam more often, which multiplies the value of the extra pierce.
• 0-3-1 or 0-3-2 if you also want the foam to slow bloons. Pin (0-0-2) adds a short slow to bloons that cross the foam, and Oversize Nails raises the base pierce, so this crosspath reaches 18 pierce per puddle.

The knowledge matters most in the mid game, rounds 40 to 80, where camo and regrow ceramics come in large groups. Late game you usually have other ways to handle camo and regrow, such as Signal Flare mortars or an Etienne, so the foam is less central.

Is it worth it?

Priority: situational. If you use the Engineer as a cheap decamo tool, it is a real improvement and worth taking. If you never build Cleansing Foam, the effect is zero. Its other role is as the only path to Big Traps, which is itself minor, so this whole branch is mostly for Engineer fans and players filling the tree.

In the fourth row, Backroom Deals, To ARMS! and Inland Revenue Streams all lead to stronger knowledge. Take Thicker Foams after those unless you rely on Cleansing Foam.

Where it works

Thicker Foams is active wherever Monkey Knowledge is allowed, including Impoppable and Boss Events. It is off in CHIMPS, where foam keeps its base 10 pierce, which is worth remembering because Cleansing Foam is a popular CHIMPS decamo option. Challenges with MK disabled and Rogue Legends also use the base value.

Frequently asked questions

What does Thicker Foams do?

It gives Cleansing Foam puddles +3 pierce: 10 to 13, or 15 to 18 with Oversize Nails.

What is the best Cleansing Foam crosspath with Thicker Foams?

2-3-0 for the most decamo and degrow, 0-3-2 if you also want the slow from Pin.

How much does Thicker Foams cost?

One Knowledge Point and 250 Monkey Money once, after Vigilant Sentries and 3 points in Support.

Does Thicker Foams work in CHIMPS?

No. Monkey Knowledge is disabled in CHIMPS.