Nano

Nano is a new property of Bloons in the next Bloons Tower Defense game. Bloons with this property are so tiny that they can barely be seen. Occasionally, they may form groups that move together as a whole. It is easiest to attack bloons with this property with attacks that do damage to everything within a certain range, rather than focused attacks, because even at slow speeds, it is difficult to target them effectively since they are so small. The Nano-Bloons that make up the O.V.E.R.P.O.W.E.R.E.D. B.L.I.M.P. are a separate type of bloon that does have the Nano property but that is robotic and extremely overpowered.