Depleted Bloontonium Darts

Depleted Bloontoinium Darts is an upgrade for the Dartling Gun which allows the tower to pop any bloons, including Leads. The darts the Dartling Gun shoots look no different. A Laser Cannon without this upgrade cannot pop Lead Bloons but a Ray of Doom can without this.

Trivia

 * Depleted bloontonium has the same effects as the real-world depleted uranium, yet is closer to plutonium in name.