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.

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

High amounts of Monkey Knowledge upgrades are recommended before attempting Boss events, especially for Elite bosses. Recommended Monkey Knowledge points are listed below, with all of them aiding greatly in defeating the boss. They are not required, but lacking many of them makes defeating the boss far more difficult, especially the Elite boss.

Purposes	Monkey Knowledge	Reasoning
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. More Cash's +$200 starting cash allows many more early-game options; income generators can be player earlier, making a snowball effect that exponentially increases farming. Alternatively, more Heroes can be purchased immediately with the increased starting cash. Combined with Hero Favors and Empowered Heroes, starter heroes become more efficient to carry the early-game and more cash can be used for farming. If Dart Monkeys are enabled, the Free Dart from Bonus Monkey! is free defense, so even less defense is needed and income generators can be bought even earlier without costing many lives
Income	Farm Subsidy, More Valuable Bananas, Bigger Banks, Inland Revenue Streams, Bank Deposits	These Monkey Knowledge points greatly increase the income generated by making Farms more efficient. Farm Subsidy allows the 1st farm to be purchased earlier by making it cheaper. More Valuable Bananas makes 0-2-3 Marketplace more cost-efficient than 2-0-3 if buying them immediately, while greatly improveing late-game farming with 5-2-0 Banana Central + 4-2-0 Banana Research Facility spam. Inland Revenue Streams is 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	Selling is often required to get defense for the Boss or for better farms. By gaining more money from selling, it is easier to transition into expensive income generators, buy defense, and supply cash sacrifices for 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 greatly, especially against Elite Bosses. The other Monkey Knowledge points improve the DPS of non-Paragons, such as There Can Be Only One if Paragons are banned.

Rounds 1-39 (pre-Tier 1)

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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). To start, place a 0-0-0 Dart Monkey, then the Hero (start with them if possible), then additional defense 1 (referenced in the table): Monkey Sub (preferred with Military Conscription), Boomerang Monkey (preferred with Recurring 'Rangs), Engineer Monkey, or Druid. 1-2 more Dart Monkeys is also an option. Then, obtain two 2-0-0 Farms.

After the player has two 2-0-0 Farms (or earlier if the defense is already being pressured), the player can save to place the Hero if it has not been placed. Otherwise, additional defense 2 (referenced in the table) can be obtained by upgrading one of following towers (if present): Engineer to 1-0-0, Boomerang to 1-0-2, or Druid to 1-0-0.

The Camo Bloon in round 24 is normally ignored, but Lead defense is needed for 28 and 30. The 0-0-0 Bomb Shooter, 0-0-0 Alchemist, and 1-0-0 Druid are common options. Before Bloon Trap is obtained, the Engineer can be upgraded up to 3-0-2 and the Boomerang up to 2-0-2 if needed. Listed below is a quick summary of the early-game. Obtain a 0-2-3 Crossbow on Round 33 to solve all pre-Tier 1 Camos.

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		Engineer, Boomerang, or Druid are alternatives.	Free Dart Monkey		Engineer, Boomerang, or Druid are alternatives.	Free Dart Monkey		Skip if not available.	Free Dart Monkey		Engineer, Boomerang, or Druid are alternatives.
2	Geraldo		Geraldo can be delayed to ensure the Figure can be bought at most 2-3 rounds after placing him ($785 max).	Benjamin		Place him as soon as possible, even if mid-round.	Hero		Any Hero affordable with the starting cash.	Additional defense 1		Any of the towers listed above also work.
3	Rare Quincy Action Figure			Additional defense 1		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 1		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 2		Alternatives listed above can also be used. 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 2		Alternatives listed above can also be used. Sometimes not needed.				Additional defense 2		Alternatives listed above can also be used. Sometimes not needed.
6	Additional defense 2		Alternatives listed above can also be used. Sometimes not needed.

Listed below is the recommended farming progression, with procedures for Monkeyopolis being referenced.

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.

Farming_progression_recommendations

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		0-1-4, target as close to entrance as possible, 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,		Obtain Monkeyopolis, then Bloon Trap, then spam Marketplaces until Round 38	Marketplace		Spam until Round 38	Bloon Trap
5	Bloon Trap, Marketplace		Obtain Bloon Trap, then spam Marketplaces until Round 38	Marketplace		Sell everything for Monkeyopolis & Boss Defense after Round 39	Marketplace		Spam until Round 38

If Monkeyopolis is present, all defense and income generators are ideally placed in its range, which applies later on as well. 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. If Monkeyopolis is banned, replace it with Marketplace spam.

Rounds 40-59 (pre-Tier 2)

The early 40s require focus on defending the boss, so farming will be limited during this time. After the Boss is popped, sell all Boss defenses and resume farming in earnest. Bloon Traps will perform the bulk of the defense, with 1 kept during the Boss and a 2nd one before Round 47. with MOAB Maulers or a MOAB Assassin to break the MOAB Shells. Obtain a Cleansing Foam for Camos, and target it above a location where Bloon Traps are dropped. Farming recommendations are listed below.

Farming_progression_recommendations

Step	On maps without abundant water			On maps with abundant water
	Name	Portrait	Notes	Name	Portrait	Notes
1	2x BRF, 2x Overclock		Obtain after the Boss is defeated, BRFs to 4-2-0, overclock the BRFs	15x Merchantman		Obtain after the Boss is defeated
2	Marketplace, Central Market		When Marketplaces occupy all space near Monkeyopolis, upgrade them to Central Markets	Trade Empire		Upgrade one of the Merchantmen to Trade Empire
3	Banana Central		Overclock a BRF, sell Central Markets and Overclocks, all in range of a Favored Trades	6x Merchantman		Stop when the Merchantmen have 20x stack
4	2x Overclock		Both for Banana Central	10x Central Market		Stop on Round 58 if 10 of them have not been obtained
5	BRF, Overclock		Spam until Round 58, 1 Overclock for each BRF	Favored Trades		Upgrade the Merchantmen to Favored Trades, may not be possible if not enough income

When Banana Central is banned, replace the Marketplaces/Central Markets with BRFs.

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.