20 Star mix is the 19th level in Bloons Insanity.
To complete this level, all you have to do is aim for the Tack Bloon that is on the top. Once it pops, the dart will reach the Lightsaber Bloons below and pop at least one of them in each row, which will pop the other ones along with the Tack Bloon on the bottom left and the Ice Bloon, even if the Ice Bloon will freeze the Tack Bloon. Meanwhile, the Tack Bloon on the top would pop the Lightsaber Bloon on the top, which would pop a Spiky Bloon. Finally, that Spiky Bloon would pop the Bomb Bloon, which will pop the other Spiky Bloon that will pop the normal bloon under it.
- Despite the name, there are no stars.