Cold

Cold is a damage type introduced in Bloons TD 6. It replaced Metal Freeze and Metal Freeze/Glacier as the default damage type of the Ice Monkey. Cold-type attacks are unable to pop Lead Bloons, White Bloons, and Frozen Bloons, but can pop anything else. Bloon Wiki represents this damage type with, the upgrade icon for Deep Freeze in Bloons TD 6, since it visually depicts the act of freezing a bloon the most accurately out of all Ice Monkey upgrade icons in that game.

Cold can be switched out for Metal Freeze with the Cold Snap upgrade (formerly Metal Freeze before version 28.0), and for  Glacier with Re-Freeze. Having both modifies the Ice Monkey's damage type to Metal Freeze/Glacier.

Most Cold-type attacks will usually come with a Freeze status effect that will freeze any affected bloons, due to its endothermic theme. BTD6 Arctic Wind's aura is considered Cold, as it does not slow down White, Zebra, or Lead, but only its freeze attack can apply a freeze. Interestingly, Embrittlement has the Cold damage type by default but also comes with Brittle to make frozen bloons vulnerable to sharp and freezing damage.