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Slows Bloons down even after they thaw out!
~ BTD 4 description
Makes the bloons so cold that they move slowly even after thawing out.
~ BTD 5 description

Permafrost is an upgrade of the Ice Tower in BTD3, BTD4. BTD5 and BTD6.

It allows Bloons to stay slow once they have been unfrozen (50% speed for one layer, or two with the Deep Freeze upgrade Purchased). These are also one of the cheapest upgrades in BTD5, next to Sonic Boom, and Long Range Darts. If combined with Sabotage Supply Lines and glue it will make the red bloon as slow as a ZOMG.

Bloons Tower Defense 3Edit

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.

Bloons Tower Defense 4 Edit

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.

Bloons Tower Defense 5 Edit

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.

Bloons Tower Defense 6 Edit

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.

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