Sequential Bloon

The Sequential Bloon is a bloon in the next Bloons Tower Defense game. It has five layers, and each one must be destroyed by a different kind of attack. The first, outer layer is immune to everything other than simple projectiles (such as darts). The second layer is immune to everything other than fire. The third layer is immune to everything other than lasers. The fourth layer is immune to everything other than explosives. And the last layer is immune to everything other than road spikes. If the bloon escapes, you lose 2 lives times the number of layers it had left.