Strategy:Boss Bloon Event

Boss Bloon Events spawn extremely challenging Boss Bloons that will easily overwhelm incoherent strategies, especially the Elite version. This article will be focused on the gameplay before and between Boss spawns, as the strategy while the Boss is present varies widely depending on the Boss. Farming is key to defeating Bosses, especially Elite ones, hence this article will mostly be about farming. For strategies to defeat the Bosses themselves, consult the strategy page for each Boss Bloon: Bloonarius, Lych, Vortex, Dreadbloon, Phayze and Blastapopoulos.

High amounts of Monkey Knowledge upgrades are recommended before attempting Boss events, with More Cash, Bonus Monkey!, Better Sell Deals, and Paragon of Power being especially useful.

Recommended Heroes

Heroes are crucial to victory, providing valuable support or income and greatly simplifying the Boss. Recommended Heroes are listed below.

Name	Portrait	Reasoning & how to use
Geraldo		When placing Geraldo early, Rare Quincy Action Figure can be afforded and sold in the 30s to obtain Monkeyopolis, the most efficient farm. In addition, Rejuv Potion allows for multiple ability usages against Bosses, Paragon Power Totem makes the obtaining of expensive, high-degree Paragons such as Goliath Doomship much cheaper, and most of his other items see use as well.
Benjamin		Ben's money generation greatly simplifies the entire game by creating a snowballing effect that allows for quicker farming. In addition, Biohack is useful in the early-game, and his Level 5 buff to Monkey Banks is very useful.
Early game Heroes		The listed heroes are not as powerful as Geraldo and Benjamin, but become useful when both of them are banned. All of them perform solid defense against Bloons before the Tier 1 Boss spawns, allowing more farms to be built.
Support Heroes		As with early game Heroes, these heroes see use when Geraldo and Benjamin are banned. They have support capabilities for towers that perform well against Bosses, such as Adora's for Sun Avatars, Brickell's for Destroyers, and Ezili's Sacrificial Totem, which is weaker than Adora's and Brickell's support but applies to all towers nearby.

Rounds 1-39 (pre-Tier 1)

The farming for Tier 1 features obtaining minimal defense that is just enough to defeat the Bloons. The Hero saveup is done first, and then, a 0-0-0 Engineer is recommended. Upgrading it slowly and only when needed to Sprockets will generally suffice until Round 32, with a base Bomb Shooter for Rounds 28 and 30. Then, a 0-2-3 Crossbow is obtained for Camos, and Bloon Trap(s) will do the bulk of the defense starting on Round 34. If using an early-game Hero, even less defense is needed.

Procedure for Monkeyopolis without IMF Loan: Sell all income-making towers present, obtain 3 0-0-2 Monkey Commerces, get a 0-0-3 Monkey Town discounted by all 3, sell one Monkey Commerce, obtain a 0-0-0 Banana Farm discounted as many times as possible, sell the Monkey Commerces, and then obtain Monkeyopolis (absorbing the 0-0-0 Farm).

Procedure for Monkeyopolis with IMF Loan: Sell all income-making towers except IMF Loan, collect the Bank cash of IMF Loan, obtain 1 0-0-2 Monkey Commerce, obtain Monkey Town (both near the IMF Loan), sell Monkey Commerce, use IMF Loan's ability, and upgrade the Monkey Town to Monkeyopolis (absorbing the IMF Loan).

The recommended towers for the farming progression are shown below.

Step	w/ Bigger Banks and w/o Geraldo			w/o Bigger Banks and w/o Geraldo			w/ Geraldo
Step	Name	Portrait	Notes	Name	Portrait	Notes	Name	Portrait	Notes
1	2x Greater Production			4x Greater Production			Rare Quincy Action Figure
2	Monkey Bank		One Farm to 2-2-0, one to 2-0-2, then sell the 2-0-2	Marketplace		Upgrade the 2-0-0 Farms to 2-0-3 until Round 30	Greater Production		Spam until Round 29
3	IMF Loan		Collect the Bank when full, upgrade, deposit about $8,490 or all remaining cash	Bloon Trap		Use 0-1-4, obtain around Round 34, applies regardless of Hero or Monkey Knowledge	Monkeyopolis		Sell everything after Round 30 with high Monkey Knowledge, up to after Round 33 otherwise
4	Monkeyopolis, Bloon Trap, Marketplace		Obtain Monkeyopolis, then Bloon Trap, then spam Marketplaces until Round 38	Marketplace		Spam until Round 38	Bloon Trap, Marketplace		Bloon Trap first, then Marketplaces until Round 38

Before the Tier 1 Boss spawns, sell Marketplaces if needed. If possible, obtain a Favored Trades near them before selling them. Favored Trades is recommended for selling farms for all other tiers as well.