To pop regrower bloons, you just need to have defenses that attack fast, so the bloons don't have time to heal. It's easier to pop them if your defenses are tightly clustered. Regrower bloons heal at about the same speed that Corrosive Glue pops bloons, so that won't work if the bloons are ranked green or higher. In general, regrower bloons aren't that much more dangerous than normal bloons, unless they're ceramics or camo rainbows.

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