Bloon immunity

Bloon immunity is a mechanic present in the Bloons franchise, introduced in the original Bloons Tower Defense. Certain types of Bloons are immune to a specific kind of damage type, are are usually countered by damage types outside of their immunity, such as a Lead Bloon being immune to sharp attacks but vulnerable to explosives.

While MOAB-Class Bloons and Boss Bloons usually only take less damage, reduced debuff effects, or simply can't be targeted by certain towers, the DDT and the Bloons TD 6 incarnation of Dreadbloon have specified damage immunities.

Bloons TD 6 has two Heroes that can decrease a Bloon type's resistance to a given form of damage starting at a certain level without removing the immunity completely until a later level, implemented as a 50% and later 100% chance to pop the Bloon in question with an incompatible attack. Striker Jones allows every explosive tower to have a 50% chance to pop Black Bloons starting from level 5 that increases to 100% at level 19, and Silas allows every freezing tower to have a 50% chance of freezing White Bloons starting from level 5 that increases to 100% at level 13.

Bloon immunity mechanics do not appear in Bloons Card Storm despite featuring Bloons that usually sport immunities. This was intentional on the developers' part, as they found the immunity mechanic unfair when the gameplay involves a limited amount of monkeys on the playing field.

List of Bloons with immunities

Image	Bloon type	Immunity	Introduced
	Black Bloon	Explosive damage	Bloons Tower Defense
	White Bloon	Freeze damage
	Lead Bloon	Sharp/freeze/energy(BTD6 only) damage	Bloons Tower Defense 2
	Ceramic Bloon	Glue slowdown (BTD3, 4, and Flash versions of 5, Battles and BMC only)/magic damage (BSM2 only)	Bloons Tower Defense 3
	Zebra Bloon	Explosive/freeze damage	Bloons TD 4
	DDT	Explosive/sharp/freeze(BMC only) damage	Bloons Monkey City
	Dreadbloon	Sharp damage/damage from a specific tower category for each skull tier(BTD6 only)
	Glass Bloon	Energy/acid(BTD6 only) damage	Bloons Supermonkey 2
	Purple Bloon	Energy damage	Bloons TD 6
	Dreadrock Bloon	Dreadbloon's current tower category immunity