The Big One

The Big One is the final upgrade of the path 1 for the Mortar Tower. It costs $8500 (Easy), $10000 (Med), $10800 (Hard). It makes devastatingly large explosions, each popping through 5 layers of bloon. This upgrade is unlocked at Rank 37.

Trivia

 * These are useful for making the game lag less because of how large the explosions are, the huge range along with the fact that they take out more bloons instantly.
 * The explosion is injected with Bloontonium so that not even black bloons or zebra bloons can escape; their anti-bomb shells cannot withstand it.
 * If you set the aim for a Mortar Tower with The Big One on the center of Mt. Magma, it will cover the entire circular center.
 * This is the only upgrade to increase the popping power of Mortars. Every other Mortar has a popping power of 40, while The Big One has a popping power of 100 (in addition to popping 5 layers, meaning the Big One can pop up to 3,300 bloons in a single shot (if it hits 100 Ceramics with 1 HP left)
 * The monkey next to The Big One is wearing the same clothes as a Glue Hose Glue Gunner.
 * This is useful if you face Pink Bloons because it's strong enough to the point where pink bloons wil be instantly destroyed the second the mortar hits them.
 * The Big One is made out of partly Bloontonium because of the radioactive sign on the mortar and the cannon.
 * These are therefore made in Bloontonium Lab.
 * According to the upgrade picture, The Big One cannot safely be touched by the monkeys (even with gloves) without the help of tongs to insert the morter. However the monkey is not using them in-game, so the upgrade picture could be purely for emphasis to show how dangerous The Big One is to bloons.
 * If a lot of these are targeting the same area, they cause some serious bloon damage for everything up to Ceramic Bloons.
 * The explosion sizes are the same of the missiles fired by a Temple of the Monkey God.
 * The Big One is one of the towers whose explosions can pop black and zebra bloons, the other ones being Bloon Impact and Hydra Rocket Pods.
 * The Big One is replicates the Davy Crockett Weapon System.
 * The Big One has a weakness however... M.O.A.B. Class Bloons.
 * If you buy this upgrade with Burny Stuff for both Mortar Towers on the Direct Assault mission just before round 23, you can pass the mission without spending a single Monkey Buck.