Contact Damage

Contact Damage is a projectile behavior characterized by its capability to rehit the same bloons more than once with the same projectile. It is part of the damage types family.

Contact Damage is represented on Bloons Wiki as, the upgrade icon for Kylie Boomerang in Bloons TD 6, as its kylie boomerang attacks are physical attacks that can rehit the same bloon more than once with the same projectile. Contact Damage is distinguished from Spray, Extra Damage , or any damage-over-time status effects; Contact Damage is expressly the same projectile rehitting the same bloon more than once. Contact Damage is separate from something where a single projectile deals more than one damage with each hit, if multiple projectiles deal multiple hits, or if a status effect causes more than a single damage tick. Spike Pile has Contact Damage by default and is merged into there.

There are two types of Contact Damage: limited by pierce, and contact damage via pierce refresh. Attacks such as spikes and Kylie Boomerangs deal with pierce by losing pierce as they hit bloons (hence "limited by pierce"). Attacks such as Wall of Fire continuously damage bloons but cap at a maximum pierce per damage tick.

Typical examples with Contact Damage include Kylie Boomerang, Wall of Fire, Ultra-Juggernaut's ultra-juggernaut balls, Plasma Accelerator laserbeams, and the BTD6 Ray of Doom. Spirit of the Forest's vine growths are also considered Contact Damage plus On-Track and Infinite Pierce.

Since Version 28.0, Druid of the Jungle now produces "after-vines" from vine-popped bloons that also work like Walls of Fire.

Most projectile-based attacks do not have Contact Damage and can only hit the same bloon more than once. For an attack to be considered Contact Damage, the contact damage should be attacked by the same projectile. BTD6 Glaive Lord and Bloontonium Reactor do not count because area-of-attacks that originate straight from the tower itself are more considered as a damage zone via Zone than Contact Damage.

In Bloons Pop!, Contact Damage is extremely common, with the vast majority of Monkey attacks capable of hitting the same bloon with the same projectile. It is easier to list the attacks that cannot deal Contact Damage:
 * Striker Jones' rockets
 * Captain Churchill's shells
 * Gwendolin's Cocktail of Fire bursts
 * Mortar Monkey and Mega Mortar Monkey explosions
 * Acid Gunner and Mega Acid Gunner's application of corrosive glue