Bloon Stacking

Bloon Stacking is a mechanic that allows muliple bloons of the same type with the same special properties to enter the track without increasing lag. Instead of the bloons each having a seperate amount of HP, the stack, as a whole has the same amount of HP, which, at max is the amount of HP times the amount of bloons in the stack.

Projectiles
When a projectile hits a stack, if the remaining popping power of the projctile is greater than or equal to the # of bloons, then the HP, as a stack is decreased by the amount of damage the projectile would normally do to a single bloon times the number of bloons in the stack. However, if the remaining popping power of the projctile is less than the # of bloons, then the HP, as a stack is decreased by the amount of damage the projectile would normally do to a single bloon times the remaining popping power of the said projectile.

Trivia

 * Bloon absorbers have unlimited pierce, so they are effective against all but the largest stacks.