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, also 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 with the Tier 1 Boss appearing in Round 40 and 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 some rewards after beating each Tier, but if the Boss reaches the exit or is not beaten after 20 rounds since spawning will result on defeat even if no lives are lost. While the Boss is on the screen there is no breaks between rounds even if Auto-start is disabled. Some bosses might also feature custom rounds (see the page for each Boss for details).

The events are usually be 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 more 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 and shared solo mode, meaning they can't be earned more than once in a single event.

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 and will keep running until is defeated, the timer 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, or the Marine deployed by the Special Poperations ability do not increase the score.

Evert 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 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 a smaller pool of players known as the Mini-Boss, the ranking in this ladder will also grant additional prizes.

Rewards

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Strategy

For more in-depth strategies, see Strategy:Boss Bloon Event.

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Gallery

Screenshots

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