Strategy:Boss Bloon Event

Here is the icon of the inactive Boss Bloon Event, which If a Boss Event is active, which changes to the featured boss when the event is active.

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.

Recommended Monkey Knowledge

Purposes	Monkey Knowledge	Reasoning & how to use
Early-game	More Cash, Bonus Monkey!, Hero Favors, Empowered Heroes	Most Boss Events start on early rounds, and certain MK make early-game much easier. If you get More Cash, the +$200 starting cash allows you to begin with many more options; you can place a Farm earlier, making income sooner to buy even more Farms. Alternatively, you can start with a wider variety of heroes with the increased starting cash. Combined with Hero Favors and Empowered Heroes, starter heroes become more efficient to carry the early-game as you save money towards Farms. If Dart Monkeys are enabled, the Free Dart from Bonus Monkey! is free defense; you can spend less to defend, so you can buy your first income-generator sooner without costing too many of your lives.
Income	Farm Subsidy, More Valuable Bananas, Bigger Banks, Inland Revenue Streams, Bank Deposits	You will need as much income as possible quickly if you want to have an easier time in Boss Events. Farm Subsidy allows you to buy a Farm sooner, so you can begin making money sooner. More Valuable Bananas makes 0-2-3 Marketplace more cost-efficient than 2-0-3 if buying them immediately, and also greatly improves late-game farming with 5-2-0 Banana Central + 4-2-0 Banana Research Facility spam. For Inland Revenue Streams, this beneficial when transitioning to Monkeyopolis + Bloon Trap, as well as Least Tiers if wanting to make income with as few tiers as possible. Bank Deposits opens up a new method of farming: IMF Farming, which stands out for pre-T1 income generation. Deposit money into the IMF Loan until about $8,490 for the most efficient use of the short-term interest.
Selling	Flat Pack Buildings, Better Sell Deals	Often in Boss Events, you will need to sell towers to buy better stuff. By gaining more money from selling, it is easier to transition into expensive income generators, buying defense, and supplying cash sacrifices for your Paragon(s).
DPS	Veteran Monkey Training, There Can Be Only One, Deadly Tranquility, Paragon of Power	Paragons are far more efficient than most T5 towers against Boss Bloons. The extra attack speed for Paragons matters a lot, especially against Elite Bosses. Not only that, certain Monkey Knowledge vastly improves the DPS of non-Paragons as well, especially There Can Be Only One if Paragons are banned.

Rounds 1-39 (pre-Tier 1)

Preparing to defend the Tier 1 boss features spending as little into defense as possible to defeat the Bloons so all the money can be put into income generation (farming). Single digit rounds and the early 10's can be defended for very cheap using some options.

• Dart Monkey + Monkey Sub: On a single lane map with no intersections (ex. Off The Coast) they can defend reliably without micro/targeting until Round 14 with minimal leaks which can be covered by Pre-game Prep. Is recommended to have Bonus Monkey! so the Dart Monkey is free, but not needed. This is the cheapest defense when paired with Military Conscription.
• Dart Monkey + Boomerang Monkey: Can also defend until Round 14, but a few more leaks and more expensive in high Monkey Knowledge scemarops compared to the Sub.
• 3 Dart Monkeys: The most expensive of these three options but will also defend until Round 14.
• In case some of the strategies listed above are not available, any combination of two towers between Dart, Sub, Boomerang, Ninja, Druid, or Engineer are also reliable, with the later 3 can be upgraded later as the rounds progress, but they have the disadvantage of being more expensive, delaying farms.
• Quincy, Sauda and Obyn can also be used for this purpose, with the advantage that they can also deal with the 30's camo by their own. If More Cash is available and/or by letting Round 1 leak/be popped by spikes, Gwen and even Corvus become options.

After placing the initial towers, the player should focus on placing Geraldo / Benjamin (if available) and a Banana Farm as soon as possible (You can start with Dart only and Geraldo can be delayed so the Quincy Figure can be bought immediately or at most 2 rounds after placing him). After getting the Farm, it should be upgraded to 2-0-0 before placing a second farm and also upgrade it to 2-0-0. Farms should be placed near water, if possible.

After the player has two 2-0-0 farms (or earlier if the defense is already being pressured), the player can save to place their Hero if if isn't on the field already. Otherwise common follow up towers on the on the late 10's and early 20's for defense include Engineer, Ace, Buccaneer or Druid. At this point is better to put an additional monkey that will provide more utility later rather than upgrade existing Darts, Boomerangs or Subs as they are very likely to be sold.

Early Game Quick Guide

Step	Geraldo			Benjamin			Early Hero			Late Hero
	Name	Portrait	Notes	Name	Portrait	Notes	Name	Portrait	Notes	Name	Portrait	Notes
1	Free Dart Monkey		Ninja, Engineer, Boomerang or Druid are alternatives.	Free Dart Monkey		Ninja, Engineer, Boomerang or Druid are alternatives.	Free Dart Monkey		Skip if not available.	Free Dart Monkey		Ninja, Engineer, Boomerang or Druid are alternatives.
2	Geraldo		Geraldo can be delayed to ensure you can buy the Figure at most 2-3 rounds after placing him ($785 max).	Benjamin		Place him as soon as possible, even mid-round	Hero		Any Hero that you can afford with the starting cash.	Additional defense		Any of the towers listed above also work.
3	Rare Quincy Action Figure			Additional defense		Any of the towers listed above also work.	2× Greater Production		Buy one farm first, upgrade it, then the second.	2× Greater Production		Buy one farm first, upgrade it, then the second.
4	Additional defense		Shooty Turrets, or any of the towers listed above also work.	2× Greater Production		Buy one farm first, upgrade it, then the second.	Additional defense		Other options are Boomerang, Ninja, Ace, Buccaneer or Druid. Sometimes not needed.	Hero		Can be placed earlier if defenses are being pressured.
5	2× Greater Production		Buy one farm first, upgrade it, then the second.	Additional defense		Towers listed above, Buccaneers and Aces can also be used.				Additional defense		Other options are Boomerang, Ninja, Ace, Buccaneer or Druid. Sometimes not needed.
6	Additional defense		Towers listed above, Buccaneers and Aces can also be used.

The camo bloon in round 24 is normally ignored but Lead defense is needed for 28 and 30. Common defenses include Alchemist and 1-0-0 Sniper / Druid as they can be further upgraded to Lead to Gold, Night Vision Goggles / Elite Defender or Druid of the Jungle, respectively.

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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
	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.

Rounds 40-59 (pre-Tier 2)

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Rounds 60-79 (pre-Tier 3)

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Rounds 80-99 (pre-Tier 4)

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Rounds 100-119 (pre-Tier 5)

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General recommendations for all Bosses

• Letting a few bloons leak during the early game is fine to place a farm or get some of their upgrades a little earlier. If the player has Mana Shield and/or Healthy Bananas and planning to build Market Places / Central Markets, being more greedy can payoff. However, if the Boss is Lych, the players should be more conservative with the lives to avoid losing to Lych-Soul.
• During a Boss battle, certain occasions may benefit from stalling or anti-stalling rounds. Stalling or anti-stalling rounds could manipulate timing for when the next rounds send out, which could affect farming, the amount of time to kill a Boss, or the natural bloon spawns.