So… Cold…

So… Cold… is a fourth-row Primary knowledge that makes the Ice Monkey's Permafrost slow stronger: bloons slowed by Permafrost move at 40% speed instead of 50%, a 60% slow instead of 50%. You need 8 Knowledge Points spent in the Primary tree and Icy Chill, plus a one-time payment of 250 Monkey Money on top of the Knowledge Point. It unlocks Big Cryo Blast and Hypothermia.

How it changes the game

Permafrost is the tier 1 top-path Ice Monkey upgrade (1-x-x). Bloons that get frozen by a Permafrost Ice Monkey stay slowed after they thaw. Every top-path Ice Monkey above it keeps that effect, and other paths can take it as a crosspath, so So… Cold… improves a lot of builds:

• Cheap 1-x-x Ice Monkeys: a Permafrost Ice Monkey becomes a better stall for the rest of your defense, which is useful as early as rounds 20 to 30.
• Top path (Cold Snap, Ice Shards, Embrittlement, Super Brittle): the lingering slow after each freeze is stronger, so bloons spend more time inside the range of your damage towers.
• Crosspaths such as 1-4-0 Snowstorm or 1-5-0 Absolute Zero: the slow after every freeze is stronger too.
• Ice and damage combos: anything that relies on bloons staying in range, such as Tack Shooters, Inferno Ring, Glue-and-burn setups or a well-placed Sniper, gets more value.

It only changes the Permafrost slow. Freeze duration, damage and range stay the same, and Ice Monkeys without Permafrost get nothing. MOAB-class bloons are not frozen by normal Ice Monkey attacks, so this is mainly a buff against regular bloons and Ceramics.

Is it worth it?

Priority: situational. For ice-stall players it is a clear buff; for everyone else 250 Monkey Money and a point are better spent elsewhere first. The stronger reason to buy it is the two nodes below. Big Cryo Blast helps the popular Cryo Cannon line, and Hypothermia extends Snowstorm and Absolute Zero freezes.

If you are deciding between fourth-row Primary nodes, Aviation Grade Glue and Master Double Cross are on the route to More Cash, and Hard Press leads to Long Turbo. So… Cold… usually comes after those.

Where it works

So… Cold… is active in all modes with Monkey Knowledge enabled, including Primary Only and Impoppable. It is disabled in CHIMPS and in challenges that turn knowledge off. The Monkey Money fee is paid once; after a respec, re-buying it costs only a point.

Frequently asked questions

What does So… Cold… do?

It makes Permafrost slow bloons by 60% instead of 50%.

How much does So… Cold… cost?

One Knowledge Point plus a one-time 250 Monkey Money. You also need 8 points in the Primary tree and Icy Chill.

Does So… Cold… affect MOABs?

Not in a meaningful way, because regular Ice Monkey attacks do not freeze MOAB-class bloons.

What does So… Cold… unlock?

Big Cryo Blast and Hypothermia.