Regrowth Bloon

Regrowth Bloons (or Regenerating/Regen Bloons) are heart-shaped bloons that grow one extra layer for each second, up to their original form (e.g. if a pink regrowth bloon is popped into a green regrowth bloon, it will only regenerate up to pink).

Regrowth Bloons can also have Camo status at the same time, making them particularly dangerous. Regrowth Bloons can appear on any level of the bloons family line from Red Bloon to Ceramic, although MOAB-Class Bloons can't be Regrowth Bloons, nor their spawned children.

Strategy
Regrowth Bloons born in groups from their parents will also grow separately and will not merge, meaning that a single Ceramic Regrowth Bloon can easily multiply into a large army. A good example of this would be a Black Regrowth Bloon being popped into 2 Regrowth Pink Bloons, which regenerate into 2 blacks, which each get popped into 2 pinks, and so on. It is best to destroy these bloons quickly.

Trivia

 * If the player popped a that had just regrew its old layer, the player will get money for popping that layer. The player will only get money for popping the layer below the ones you popped. If bloons that have multiple children regrow to such kind of bloon after being popped the player gets extra money.
 * This is often called regen farming.
 * If a Rainbow Regrowth (spawned from a Ceramic) regenerates, it will regenerate straight into the Ceramic (skipping the cracks).
 * Corrosive Glue acts faster than regeneration. However, it will take a while before the bloon is totally popped and is not recommended for popping s.
 * In the Covert Pops Special Mission, bloons that are normally Camo become Regrowth as well.
 * Beekeepers are good for popping Regrowth Bloons that do not have multiple children.
 * Cleansing Foam can remove the regeneration properties of a Regen Bloon.
 * Regrowth Lead Bloons can be very hard to beat with only Road Spikes and Pineapples because you would have to use a Pineapple to pop the Lead layer. However, by the time you place Road Spikes, the bloons may have regenerated into lead again, and so on.
 * Fortunately, they only appear in Sandbox Mode, Apopalypse Mode, Special Missions, Bloons TD Battles, and some Daily Challenges.
 * Spiked Ball Factories can remove the threat of Ceramic and Lead s.
 * Bloon Liquefiers are best against Regrowth Bloons.
 * Red Bloons are available in regrowth form in the Sandbox Mode menu, but they are unnecessary because if they are popped, the entire bloon will be gone, so it will not be able to regrow.