|“||Slows Bloons down even after they thaw out!||”|
|~ BTD4 description|
|“||Makes the bloons so cold that they move slowly even after thawing out.||”|
|~ BTD5 description|
|“||Bloons move slowly even after thawing out.||”|
|~ BTD6 description|
It allows Bloons to stay slow once they have been unfrozen (50% speed for one layer, or two with the Deep Freeze upgrade purchased). It is also one of the cheapest upgrades in BTD5, next to Sonic Boom, and Long Range Darts.
In BTD6, this upgrade returns as the first upgrade of Path 1. Again, its slows bloons by 50% once unfrozen, but only lasts for one layer (2 with Deep Freeze, 4 with Absolute Zero). When crosspathed with any Tier 5 upgrade, including upgrading to Super Brittle, the Permafrost applies to blimps upon damaging, but with only 25% slowdown instead of 50%.
In Bloons TD 3, Permafrost is the 2nd upgrade for the Ice Tower, it costs $215 on Easy, $255 on Medium and $270 on hard.
In Bloons TD 4, Permafrost is the 2nd upgrade for the Ice Tower, it costs $85 on Easy, $100 on Medium and $110 on hard.
In Bloons TD 5, Permafrost is the 1st upgrade for the second path, it costs $85 on Easy, $100 on Medium, $110 on Hard and $120 on Impoppable. If combined with Sabotage Supply Lines and glue it will make a red bloon or lead bloon as slow as a ZOMG.
In Bloons TD 6, Permafrost is the 1st upgrade for the first path, it costs $85 on Easy, $100 on Medium, $110 on Hard and $120 on Impoppable.
- Permafrost is a cheap upgrade to get to slightly boost your Ice Tower's capabilities, usually featured in extremely optimised strategies.
Version History (BTD6)Edit
Tier 5 upgrades now apply Permafrost effect to MOAB-class bloons, although half the slowdown will be applied.
- In Bloons TD 3, this upgrade was called Perma Frost.