Boss Bloon Event
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Boss Bloon Event is an event in Bloons TD 6 involving Boss Bloons, introduced in version 27.0. The Boss Bloon Event's button appears in the top-right of the game's home screen when the event is active.
The Boss Bloon Event generally runs from early Saturday to early Thursday, but there are exceptions, usually when an update is about to be released, which leads to events ending earlier. The active Boss Bloon Event generally cycles between the six current bosses, Bloonarius, Lych, Vortex, Dreadbloon, Phayze, and Blastapopoulos, except during the 4 weeks after an update that releases a boss, during which only events featuring the new boss are run.
Mechanics
Boss Bloon Events play in a similar manner to a Boss Challenge but the Map and Boss Bloon the players will face are fixed. Some modifiers can be applied such as the speed/health of Bloons, MOAB-Class Bloons or the Boss itself to increase or reduce the difficulty. In some events additional starting cash can be granted. Additionally, some Heroes, towers or upgrades might get restricted. A limit on the number of Paragons that can be on the map at the same time can also be enforced, this limit is usually 4 but can be as low as zero or as high as having no limit. The player also starts with 200 lives for the Normal Boss and 100 for Elite.
In the same way Boss Challenge does, the game starts in Round 1 and finishes in Round 140. The Tier 1 Boss appears in Round 40, and the successive tiers will reappear with greater strength every 20 rounds until the Tier 5 boss spawns at Round 120 and finishes at end of the round where this Boss is defeated. Players will 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 custom rounds on some of the rounds they spawn, and Lych, Vortex, Dreadbloon feature changes on other rounds as well (see the page for each Boss for details).
The events are usually played on Medium difficulty, but other game modes such as Easy, Alternate Bloons Rounds or Half Cash can be featured. Players are allowed to use Insta Monkeys, Powers and the in-app purchase Double Cash Mode. Maps of all difficulties and even the special Protect The Yacht map have been used in the events, but Beginner maps are selected the most often. The Normal version of the Boss must be beaten to unlock the Elite version, which can feature different modifiers and restrictions.
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 
100 (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.
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. 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.
During a Boss Bloon Event, the featured boss cannot be selected in Boss Challenge mode.
Ranked Mode
Before starting a game, players can also check a box in the lower left part of screen to play in Ranked Mode, in which the players compete to place as high as possible on the 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.
There are three scoring types, 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 a upgrade / paragon 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 / paragon is purchased. Gizmos and Sub-towers such as Geraldo's shop items and the Marine deployed by the Special Poperations ability do not increase the score.
Every week, one of these three scoring types is selected 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.
There is also a penalty timer (shown in red below the boss banner/health bar) that starts running if the player takes too long to beat the non-boss rounds, it works by running a invisible countdown that starts at 10 + Round Number × 0.25 seconds after the last Bloon of the round enters the screen and when is depleted the penalty timer will start/resume and keep counting until round is completed. At the end of the game the 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.
Ranked Mode can also be played in Co-op mode and the score of the team is recorded in a independent Leaderboard (there are different rankings for teams of 2, 3 or 4 players). If the players have scores in multple Leaderboards for the same Boss difficulty, only the highest prize will be earned.
In addition to the global ranking, players who defeat the Boss are also placed automatically in a Leaderboard with pool of up to 100 players known as the Mini-Boss, with the players in the Mini-Boss gaining additional prizes based on their ranking within the Mini-Boss. Co-op and solo players may be placed in the same Mini-Boss.
Rewards
For defeating tiers
| Tier | Normal | Elite |
|---|---|---|
| 1 | 50
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50
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| 2 | 50
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100
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| 3 | 75  MOAB Mine ×1
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150  5 Trophies  Cash Drop ×1
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| 4 | 100 5 Trophies  Banana Farmer ×1  Random tier 2 Insta ×1
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200 15 Trophies  Super Monkey Storm ×1  Random tier 3 Insta ×1
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| 5 | 125 25 Trophies  Tech Bot ×1 Random tier 3 Insta ×1
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250 50 Trophies  Monkey Boost ×1  Random tier 4 Insta ×1
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For Ranked
| Leaderboard position | Normal | Elite |
|---|---|---|
| 1st | 1,000 40 Trophies  Random tier 5 Insta ×1 Random Power
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1,000 60 Trophies Random tier 5 Insta ×1 Random Power
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| 2nd | 750 35 Trophies Random tier 4 Insta ×1 Random Power
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750 50 Trophies Random tier 4 Insta ×1 Random Power
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| 3rd | 500 30 Trophies Random tier 4 Insta ×1 Random Power
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500 40 Trophies Random tier 4 Insta ×1 Random Power
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| Top 50 | 450 25 Trophies Random tier 3 Insta ×1 Random Power
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450 30 Trophies Random tier 3 Insta ×1 Random Power
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| Top 1% | 400 20 Trophies Random tier 3 Insta ×1
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400 25 Trophies Random tier 3 Insta ×1
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| Top 10% | 300 10 Trophies Random tier 2 Insta ×1
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300 15 Trophies Random tier 2 Insta ×1
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| Top 25% | 200 6 Trophies  Random tier 1 Insta ×1
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200 10 Trophies Random tier 1 Insta ×1
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| Top 50% | 100 3 Trophies Random tier 1 Insta ×1
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100 5 Trophies Random tier 1 Insta ×1
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| Top 75% | 50 2 Trophies Random tier 0 Insta ×1
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50 3 Trophies Random tier 0 Insta ×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
Related achievements
Strategy
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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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