Boss Bloon Event
Boss Bloon Events, also called Boss Events, are weekly events in Bloons TD 6 introduced in version 27.0 where players encounter Boss Bloons in a modified version of a Boss Challenge. In each event, one of the Boss Bloons is selected to appear on a map, possibly with some challenge modifiers such as tower and hero restrictions. Victory is achieved in a Boss Bloon Event by defeating all five tiers of the boss. The Elite version of the boss may not be attempted in single-player until tier 5 of the Normal boss is defeated.
Boss Bloon Events may be played in Co-op mode with up to 4 players. This event has an optional Ranked mode, which allows players to compete for spots on leaderboards and which may grant additional rewards depending on placement. Each leaderboard uses one of three scoring systems: Fastest Time, Least Cash, or Least Tiers.
While the event is active, players can access it by clicking on the Boss icon on the right of the Home Screen, via the Event menu or by selecting the featured boss in the Boss Challenge menu.
Schedule
The Boss Bloon Event usually runs weekly, starting early Saturday and ending early Thursday. There are sometimes exceptions to this schedule: for example, events typically end earlier right before a major update. Boss Bloon Events generally cycle between the six available bosses in the following order: Bloonarius, Lych, Vortex, Dreadbloon, Phayze, and Blastapopoulos. Directly after an update that releases a new boss, these events feature the new boss for 4 weeks before returning to the regular order.
Since version 31.0, during the final hour of the event, players on Ranked Mode cannot start a new run and the those who are in the middle of a game will not be able to resume if they exit the game. This was done with the intention of preventing scores from being submitted past the ending time of the event.
While a Boss Bloon Event is active, the featured boss cannot be selected in Boss Challenge mode.
Mechanics
Boss Bloon Events are just a modified version of the Boss Challenge game mode, so is natural that most, if not all mechanics from that game mode apply to Events.
Ruleset
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It has been suggested that the contents of this section should be split into Challenge rule. Discuss your thoughts on the talk page. The editor who added this notice elaborates: Most of this information applies to all modes with challenge rules, not just boss events |
Each Boss Bloon Event has a different ruleset, which determines many aspects of gameplay including the type of Boss encountered and the map it is played on. In addition, there are many modifiers which may be in place during each event. Possible modifiers include those available in the Challenge Editor, plus some specific to Boss Bloon Events.
| Rule/modifier | Default value | Note(s) |
|---|---|---|
| Difficulty | Medium | Usually Medium, but Easy, Hard, and Impoppable have all been used before in Boss Bloon Events. |
| Game mode | Standard | Usually Standard. Half Cash, Alternate Bloons Rounds, and Reverse have been used before in Boss Bloon Events. |
 Starting cash
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$650 ($850 with  More Cash)
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Unlike in regular co-op mode, no additional starting cash is given in co-op Boss Bloon Events. |
 Starting lives
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200 in Normal, 100 in Elite | |
| Max lives
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5000 | Hidden in-game. |
 Start round
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1 | Has been set as high as 39, but never higher. |
 End round
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140 | Always 140. However, if the player reaches round 140 without defeating the tier 5 boss, they lose instantly. The player wins by defeating the tier 5 boss, without needing to play up to round 140. |
 Max Monkeys
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Unlimited | In co-op mode, each player has their own monkey limit. For example if Max Monkeys is 10, each player may place up to 10 monkeys for a maximum of 40 monkeys on the screen in 4 player co-op. |
 Max Paragons
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4 | All Paragons count toward this limit regardless of which player placed it. |
 Bloon speed
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100% | Usually 120% if the boss is Vortex. |
 MOAB speed
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100% | Usually 110% if the boss is Vortex. Does not affect the boss. |
 Boss speed
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100% | |
 Ceramic health
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100% | |
 MOAB health
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100% | Does not affect the boss. |
 Boss health
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100% | |
 Regrow rate
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100% | |
 Ability cooldown rate
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100% | |
 Removable cost rate
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100% | |
 Monkey Knowledge disabled
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No | |
 Selling disabled
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No | |
 Powers disabled
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No (always Yes in Ranked mode) | |
 No continues
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No | Boss Bloon Events use a different system than regular games, allowing the player to go back to the previous checkpoint at any time, or retry the last round when they lose. A checkpoint is reached every 20 rounds. |
 All Camo
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No | |
 All Regrow
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No | |
 Double Cash disabled
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No (always Yes in Ranked mode) | |
 Fast Track disabled
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No (always Yes in Ranked mode) | Using Fast Track allows the player to start on round 35 with $10,150 ($10,350 with More Cash).
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| Leaderboard type | - | Only affects Ranked mode. One of Fastest Time, Least Cash, or Least Tiers. |
Boss Bloon Events may restrict possible Hero and Tower selections to a specific set, and restrict the quantity and upgrades of such towers.
Maps of all difficulties including the special Protect The Yacht map have been used in events, but Beginner maps are selected most often. The Elite version of the boss may feature different modifiers and restrictions than the Normal version, but is always played on the same map.
Boss rounds
The tier 1 boss appears on round 40, and the successive tiers appear every 20 rounds until the final tier 5 boss spawns on round 120. A banner will be visible at the top of the screen indicating the number of rounds remaining until the boss appears and while it is on the screen, the banner is replaced by the boss' health bar. Players receive rewards after beating each tier, but if the boss reaches the exit or is not beaten after 20 rounds since spawning, a defeat will occur even if no lives are lost. While the boss is on the screen, there are no breaks between rounds even if Auto Start is disabled. All bosses feature a custom round on most of the rounds on which they spawn (Round 40, 60, 80 and 100). In addition to this, Lych, Vortex and Dreadbloon feature changes on other rounds as well (see the page for each boss for details).
After round 20, the player can choose to restart the game at the last round multiple of 20 they have passed (Round 20, 40, 60, 80, 100 or 120) at the cost of some Monkey Money. The cost starts at 
100 and increases by an additional 100 every 20 rounds. If the player is defeated they may also choose to restart the last round by paying twice the amount of the 20 round reset. Exiting the the game and returning only restarts the current round with no additional penalties.
Co-op
Boss Bloon Events can also be played in Co-op mode with in public or private lobbies. The rules for cash sharing are the same as in regular Co-op modes. Unlike regular Co-op, no additional starting cash is granted, and the map split cannot be changed from the map's default split.
In this mode, the health of the boss is increased by 20% for each additional player (+20% for 2, +40% for 3 and +60% for 4 players). The rewards for beating each tier are the same as in solo, given in full to each player in the team, and can't be earned after having already done so in solo.
Ranked Mode
Before starting a game, players may check a box in the lower left part of the screen to play in Ranked Mode, in which players compete to place as high as possible on a leaderboard for additional prizes. This mode disables Insta Monkeys, Powers and in-app purchases to prevent pay-to-win scenarios. Everything else regarding to the event (Boss, Map, modifiers and restrictions) is the same as non-ranked mode.
Scoring
There are three scoring types, and in all of them a lower score is better:
- Fastest Time: A timer starts the moment a Boss Bloon enters the screen, keeps running until is defeated, and resumes every time the boss returns on later tiers.
- Least Cash: A counter is increased by the amount of cash spent when a tower is placed or an upgrade is purchased. Paying cash to purchase items at Geraldo's Shop or using map features such as removing obstacles or gizmos also increase the score.
- Least Tiers: A counter is increased by one every time a tower is placed or a upgrade is purchased including Hero levels and Paragon upgrades. Gizmos and Sub-towers such as Geraldo's shop items and the Marine deployed by the Special Poperations ability do not increase the score.
There is no way to reduce the amount of score already accumulated.
Least Cash and Least Tiers also keep track of the player's time, which is used as a tiebreaker between players with the same amount of cash or tiers spent. If players have exactly the same score including tiebreakers, then ties are broken by time of completion in favor of scores submitted earlier.
There is also a penalty timer (shown in red below the boss banner/health bar) that penalizes players for taking too long to beat non-boss rounds. Every round, 10 + Round Number × 0.25 seconds after the last Bloon of a round enters the screen, a timer begins to count up until all Bloons from that round are popped. At the end of the game, all accumulated time in the penalty timer is added to the regular Boss timer. The cooldown of cash-generating abilities is paused while the penalty timer is active, even in non-Ranked mode (where the timer does not appear), to prevent abuse and weaken strategies such as IMF Loan farming.
Leaderboards
Every week, one of the three scoring types is selected for Normal and Elite and all players who defeat the boss will be ranked according to it. The scores for Normal and Elite bosses are independent from each other, and since version 44.0, they can have a different scoring type on the same week. Regardless of the type used, the timer described above will appear because it is used as the tie-breaker in Least Cash and Least Tiers rankings.
Ranked Mode can also be played in Co-op mode and the scores of each size of team is recorded in a independent leaderboard (there are different rankings for teams of 2, 3 or 4 players). If a player has scores in multiple leaderboards for the same Boss difficulty, only the highest prize will be earned.
In addition to the global ranking, players who defeat the boss in Ranked Mode are placed automatically in a Leaderboard with pool of up to 100 players known as the Mini-Boss. Players gain additional prizes based on their ranking within the Mini-Boss. Co-op and solo players may be placed in the same Mini-Boss.
Strategy
Boss Bloon Events are usually harder than Boss Challenges, due modifiers and restrictions that can be applied each week, but in general anything that works for Boss Challenge may also work in events.
The most important advice for defeating Bosses, especially Elite versions, is to generate additional income (a.k.a. farming) and start doing so as early as possible. Notice that Normal Bosses can sometimes be beaten without additional income and a proper defense strategy but Elite Bosses are just impossible without farming.
Benjamin or Geraldo are the most used Heroes in Boss Bloon Events thanks to having methods of generating extra income that can be used to accelerate early game farms. If they are not available the Hero choice falls into two categories: Heroes that can carry the early game on their own to focus on farming (ex. Quincy, Sauda) or Heroes that have good synergy with towers which can defend the early and middle tiers (ex. Admiral Brickell + Triple Guns or Adora + Sun Avatars).
Early farming can be is usually done with strategies such as Marketplace spam or the Miniopolis (Monkeyopolis with one farm sacrifice). The latter is more efficient but depends much more heavily on Monkey Knowledge, featuring a 2-3-0 Monkey Bank obtained early, collected when full, and upgraded to IMF Loan with the rest of the money deposited. When the IMF Loan becomes nearly or completely full, it is collected, a Monkey Commerce is purchased to discount a Monkey Town near the IMF Loan, the Monkey Commerce is sold, and finally the IMF Loan's ability is used to upgrade the Monkey Town into Monkeyopolis. If using Geraldo, purchase Rare Quincy Action Figure early, spam 2-0-0 Greater Productions, and sell the NFT and all farms after Round 30 ends to get a Monkeyopolis (discounted by 3 Monkey Commerces) absorbing a 0-0-0 Banana Farm. Additional income generating towers like Bloon Trap and Rubber to Gold are also useful in this stage of the game. The use of Fast Track Mode is discouraged as the player will have less rounds to farm.
Going into the Tier 2 boss players can use farming strategies such as Boat Farming (Trade Empire with 20 Merchantmen / Favored Trades and 10 Central Markets) and/or building several Banana Research Facilities (BRFs) to upgrade one of them to a Banana Central as soon as possible. Overclock and Monkey City also often used to boost the income of such towers, with the former only used for BRFs and Banana Central.
After that, for Tier 3 and higher the farming consists in spamming the most profitable towers like BRF on land and Favored Trades in water to maximize the income generation with the intention of defending the rest of the Boss tiers with Paragons and other expensive towers.
Other towers that can be used for income generation are Bloon Trap, Rubber to Gold, Merchantman, Supply Drop, Support Chinook, Jungle's Bounty and Sun Temple with support sacrifices. This is important to keep in mind in the case Banana Farms are restricted.
Listing specific towers to defend each boss tier is difficult because their success will depend a lot on which Boss, Map or modifiers are active but commonly used options for Elite bosses are:
- Tier 1: Elite Defender, several Overdrive / Spike Storm + Embrittlement, MOAB Eliminator, First Strike Capability or Sticky Bomb.
- Tier 2: The Tack Zone with several Overdrive / Spike Storm + Super Brittle, Master Bomber, M.A.D, Sun Temple, Sun Avatar spam or Avatar of Wrath + Poplust.
- Tier 3: Several of the Tier 2 options, cheaper Paragons like Apex Plasma Master or Glaive Dominus (Degree 1 is usually enough but 20 is recommended), or even spamming some tier 3/4 towers with buffs from Call to Arms / Homeland Defense and Permanent Brew that are intended to be sacrificed to a Paragon in the late game.
- Tier 4: One or two Paragons. Nautic Siege Core, Navarch of the Seas, Ascended Shadow or Master Builder are affordable at this point with Degree 20 or higher. True Sun God or VTSG can also be used as an alternative.
- Tier 5: Three to four Paragons. At this point the most expensive ones such as Magus Perfectus or Goliath Doomship are affordable with Degree 40 or higher but if it can reach Degree 60, the battle against the Boss will be much easier.
Normal Bosses can be defeated with much lesser defenses, as a Tier 5 Normal Boss can be compared to a Tier 3 Elite. Additionally, all tiers will also benefit from towers that increase the damage the Boss takes such as Super Brittle, Cripple MOAB and Glue Strike / Glue Storm, alongside Support Sun Temples, Call to Arms / Homeland Defense and Permanent Brew to buff other towers (except when facing Lych).
For further advice consult the strategy section of the pages for each Boss Bloon: Bloonarius, Lych, Vortex, Dreadbloon, Phayze and Blastapopoulos.
Rewards
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The information in this article or section is specified server-side and can be changed by the developers at any time without warning. This information may become out-of-date at any time without notice. This information was last verified as up-to-date on: 22 November 2024 |
For defeating tiers
| Tier | Normal | Elite |
|---|---|---|
| 1 | 50
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100
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| 2 | 50
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100
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| 3 | 75,  ×1
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150,  5,  ×1
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| 4 | 100, 5,  ×1,  Random tier 2 ×1
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200, 15,  ×1,  Random tier 3 ×1
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| 5 | Default: 125, 25,  ×1, Random tier 3 ×1Collection Event: 125, 25,  35, Random tier 3 ×1
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Default: 250, 50,  ×1,  Random tier 4 ×1Collection Event: 250, 50, 70, Random tier 4 ×1
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Ranked leaderboard
| Position | Normal | Elite |
|---|---|---|
| 1st | 1,000, 40,  "Best" Power ×1,  Random tier 5 ×1
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1,000, 60, "Best" Power ×1, Random tier 5 ×1
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| 2nd | 750, 35, "Best" Power ×1, Random tier 4 ×1
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750, 50, "Best" Power ×1, Random tier 4 ×1
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| 3rd | 500, 30, "Attack" Power ×1, Random tier 4 ×1
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500, 40, "Attack" Power ×1, Random tier 4 ×1
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| Top 50 | 450, 25, "Attack" Power ×1, Random tier 3 ×1
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450, 30, "Attack" Power ×1, Random tier 3 ×1
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| Top 1% | 400, 20, Random tier 3 ×1
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400, 25, Random tier 3 ×1
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| Top 10% | 300, 10, Random tier 2 ×1
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300, 15, Random tier 2 ×1
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| Top 25% | 200, 6,  Random tier 1 ×1
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200, 10, Random tier 1 ×1
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| Top 50% | 100, 3, Random tier 1 ×1
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100, 5, Random tier 1 ×1
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| Top 75% | 50, 2, Random tier 0 ×1
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50, 3, Random tier 0 ×1
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Mini-boss leaderboard
| Position | Normal | Elite |
|---|---|---|
| 1st | 500, 15, Random tier 4 ×1
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500, 20, Random tier 4 ×1
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| 2nd | 400, 10, Random tier 3 ×1
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400, 15, Random tier 3 ×1
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| 3rd | 300, 5, Random tier 3 ×1
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300, 10, Random tier 3 ×1
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| 10% | 250, 3, Random tier 3 ×1
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250, 5, Random tier 3 ×1
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| 25% | 150, 2, Random tier 2 ×1
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150, 3, Random tier 2 ×1
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| 50% | 100, 1, Random tier 1 ×1
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100, 2, Random tier 1 ×1
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| 75% | 50, 1, Random tier 1 ×1
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50, 1, Random tier 1 ×1
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Medals
Ranked Mode
Ranked Mode medals are awarded based on the player's position on the global leaderboards once the event ends.
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Boss Event - Top 75% -
Boss Event - Top 50% -
Boss Event - Top 25% -
Boss Event - Top 10% -
Boss Event - Top 1% -
Boss Event - Top 50 -
Boss Event - 3rd -
Boss Event - 2nd -
Boss Event - 1st
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Elite Boss Event - Top 75% -
Elite Boss Event - Top 50% -
Elite Boss Event - Top 25% -
Elite Boss Event - Top 10% -
Elite Boss Event - Top 1% -
Elite Boss Event - Top 50 -
Elite Boss Event - 3rd -
Elite Boss Event - 2nd -
Elite Boss Event - 1st
Boss Bloons
Boss medals are earned by popping all five tiers of the corresponding Boss Bloon. This doesn't require playing in Ranked Mode.
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Boss Event - Bloonarius -
Boss Event - Bloonarius - Elite -
Boss Event - Lych -
Boss Event - Lych - Elite -
Boss Event - Vortex -
Boss Event - Vortex - Elite -
Boss Event - Dreadbloon -
Boss Event - Dreadbloon - Elite -
Boss Event - Phayze -
Boss Event - Phayze - Elite -
Boss Event - Blastapopoulos -
Boss Event - Blastapopoulos - Elite
Update history
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- Leaderboards for co-op boss events will now be able to display up to a 100 total ‘teams’ for each category rather than just 100 ‘players’ for each
- Added a 1 hour cutoff where no new ranked games can be created and existing ranked games cannot be entered
- Changes to Boss auto-play behavior
- if a Boss or its spawn are on screen the game & next round always starts immediately
- If a Boss is not on screen then the game does not start automatically
- If auto-start toggled off then the game will stop between rounds
- Added a new checkpoint at round 20 for boss events
- Resolved an issue with Boss checkpoint costs being pulled down causing T5 boss checkpoint to be free (bug fix)
- Loading a profile from the cloud will no longer keep boss event saves
- Boss Events now support multipliers to Boss Speed & Boss HP as an event rule
- Boss Events now support paragon count limits as an event rule
- Added a Retry Last Round ‘continue’ option for CT & Boss for a MM cost with no bonus cash granted
- Boss Speed/Health edits have event modifier icons
- Added a spicy new indicator to the main menu background for when a boss event is active
- Resolved an issue that could count Dreadbloon’s timer incorrectly after boss death (bug fix)
Bosses fail the player 19 rounds after the boss spawn instead of 20 - Note: This also fixes the restart from checkpoint bug putting the player in the next checkpoint with no boss.
- Fixed issue with retrying during Boss fights (bug fix)
- Resolved issue with checkpoints if Boss not defeated within a certain number of rounds (bug fix)
- Resolved an issue with Boss Checkpoints not being offered if taking 20 rounds to lose to a boss (bug fix)
- Resolved an issue with Boss co-op lobbies not respecting main boss menu ranked checkbox option (bug fix)
- Resolved an issue that could allow guest accounts to load into co-op event lobbies (bug fix)
Resolved an issue with Bosses scaling their health both from Boss & MOAB multipliers (bug fix)
Added Retry Last Round functionality to co-op Boss events- Resolved a number of Boss HP scaling inconsistencies (bug fix)
- Resolved an issue where T5 bosses would defeat the player earlier than intended (bug fix)
- Bosses on spawn will now clear the map of all existing projectiles
- Refactored how leaderboard scores are stored so that we could add Least Cash/Tiers ranking options for Boss Events
- Added an event icon to display if a Paragon Limit is being applied to events
- Added further support to grant events more flexibility in Boss starting and finishing rounds
- Behind the scenes maintenance on Boss leaderboard score processing
- Resolved an issue with Defeat UI being closed when Bosses leak in co-op
- Boss Event and CT Boss default Penalty Time changed ― 10s → 10 + round number * 0.25
- While Penalty time is counting in Boss Events and CT Boss, cash generating abilities will stop cooling down
- Note: This will also occur in unranked Boss Events despite the absence of the penalty timer
- Resolved an issue with low damage numbers not performing calculations correctly against exceptionally healthy targets (Bosses) (bug fix)
- Solved a game crash that happened when a player defeats the Tier 5 Boss Bloon without having the corresponding Boss Medal beforehand.
- Co-op: Default map split now set to Free-for all.
- Scores will now appear on the Leaderboard after beating the Tier 1 Boss instead of the Tier 5, however, victories on lower tiers will always be ranked lower than higher tiers.
- Top 1% medal is changed to Top 100.
- Paragon limit is now applied per player and not globally
- Diamondback is now available
- Players now only need to beat the Normal difficulty once to unlock the Elite version in the current and all future events featuring the same Boss
- Projectiles no longer spawn sub-projectiles when destroyed by the Boss Bloon entrance
- Note: This is an overall nerf for towers such as the Mega Massive Munitions Factory
- The on-screen penalty timer will now start flashing 5 seconds before it starts counting
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