Bloons take huge damage while frozen including MOAB-class Bloons.
~ BTD 6 Description
Super Brittle is the fifth and final upgrade of Path 1 for the Ice Monkey in Bloons TD 6. It allows the tower to pop 5 layers of bloon, including MOAB-class Bloons (even BADs), White Bloons, and Zebra Bloons. It also attacks about 11% faster and gains the normal damage type, allowing its ice blasts to damage any bloon type. Any bloon, including MOAB-class Bloons, that is damaged by Super Brittle takes +4 damage from each attack for up to 3 seconds. MOAB-class Bloons are not frozen in place, but are permanently slowed down by 25% (via the Permafrost effect to MOAB-class, excluding BADs).
Despite its tiny range, Super Brittle is extremely effective in combination with high-DPS towers, specifically fast-attacking, high-projectile towers or spike-based towers. In combination with the permanent slowdown via Permafrost effects, the temporary debuff towards regular bloons and MOAB-class bloons can prove super effective at demolishing them, although the Super Brittle itself has rather low pierce for its price. Super Brittle benefits much from the range bonuses from Primary Mentoring, but otherwise it needs little support due to already having innate camo detection but low direct DPS.
It is recommended to purchase a 5-2-0 Ice Monkey rather than a 5-0-2 as the monkey's fire rate is still slow.
Re-Freeze is useless on this tower, as it gains the effects of the upgrade upon buying Super Brittle.
As there is currently no visual indicator for blimps affected by the Super Brittle debuff, a working debuff is indicated through either seeing affected blimp(s) degrading quickly visually or by seeing a quick increase in damage count for the tower with the highest attack speed and/or projectile count.
As of Version 7.0, this upgrade has the smallest range out of any Tier 5 upgrade, excluding all towers whose "range" is represented for inclusion purposes (of which are Sniper Monkey, Heli Pilot, Monkey Ace, Mortar Monkey, and Dartling Gunner).
Absolute Zero used to also have the smallest range, but since Version 7.0 Absolute Zero now has twice the range of a normal Ice Monkey.
Even with the Version 17.0 buffs to its range, Super Brittle remains the smallest range out of any Tier 5 without "dummy" range.
The second-smallest goes to The Tack Zone, at 30 range, compared to Super Brittle's 25 range.
The upgrade icon for Super Brittle is displayed as shattered MOAB.
The design of the Super Brittle monkey is likely inspired by the design of Yeti in Team Fortress 2 as seen in the official Jungle Inferno update trailer.
The current upgrade description is erroneous. More specifically, MOAB-class bloons can be targeted and permanently slowed by the Permafrost effect but not be "frozen" quote-on-quote.