Any bloon from red to Lead can have the Camo property. Camo bloons can only be attacked by units with Camo Detection upgrades or by default, the Ninja Monkey, Dartling Gun, or Spike Factories. Bloons retain their Camo properties until they destroy or leak through your defenses unless they're hit by specific attacks that removes their Camo property. These bloons will start appearing usually around Round 24 in normal games.
Tips / Reminders