Halloween Collection Event (BTD6)

Halloween Collection Event is an event in Bloons TD 6 first released on Version 13.0, again in Version 21.0, and yet again in Version 28.0. The player receives candies for every finished map, together with ordinary rewards such as Monkey Money or medals. A number of candies is based on a game and track difficulty. After collecting a certain amount of candies, the player is rewarded with a crate. After opening the crate, the player receives two (or three on later stages) Insta-Monkeys. As the player collects more candies, the crates increase in quality, requiring more candy to open but yielding higher quality Insta-Monkeys in turn.

In 2019, the Halloween Collection Event lasted TBA days, from TBA TBAth/TBAth to TBA TBAth/TBAth.

In 2020, the Halloween Collection Event lasted 3 days as of now, from October 15th/16th to October 18th/19th, but was cut short due to a game-breaking bug. It then lasted from October 19th/20th to November 2nd/3rd.

In 2021, the Halloween Collection Event began on 14th October 2021 at approximately 11:00am NZDT, and is available in the Version 28.0 update. It will end on 6th November 2021 at 9:00 NZDT.

Candy rewards (2021)
Candy rewards for finishing a map were following, for default values:

However, the rewards can now be boosted if they become the Featured Candy Map for their map difficulty category. One random map from each of the map difficulties (Beginner, Intermediate, Advanced, Expert) will be chosen as the Featured Candy Map. These maps will randomize again every 8 hours. Note that all of the maps randomize again once a map has been beaten, not including if a candy status was done already.

The following values are increased to as shown below:

Candy rewards (2020)
Candy rewards for finishing a map were following, for default values:

However, the rewards can now be boosted if they become the Featured Candy Map for their map difficulty category. One random map from each of the map difficulties (Beginner, Intermediate, Advanced, Expert) will be chosen as the Featured Candy Map. These maps will randomize again every 8 hours. Note that all of the maps randomize again once a map has been beaten, not including if a candy status was done already.

The following values are increased to as shown below:

Crate rewards (2021)
Likely the same as 2020, at least the chest tiers are.

Crate rewards (2020)
Each new tier of crate was unlocked depending on the number of candies collected:
 * Wooden Crate (Tier-1) - Default
 * Bronze Crate (Tier-2) - 100
 * Silver Crate (Tier-3) - 250
 * Golden Crate (Tier-4) - 450
 * Diamond Crate (Tier-5) - 1000

Each type of crate required a specific amount of candies before being allowed to collect the crate's special Instamonkey rewards:
 * Wooden Crate (Tier-1) - 20
 * Bronze Crate (Tier-2) - 30
 * Silver Crate (Tier-3) - 40
 * Golden Crate (Tier-4) - 50
 * Diamond Crate (Tier-5) - 70

Because of the new modification to all Collection Events, 1 of 4 tower types of Instas are able to become selected as the favored tower type, each with up to 5 uses each. When a tower favor is selected, all Instas from that chest will only spawn the same tower type; otherwise it will spawn random Insta tower types as normal. All tower favors reset every 8 hours (4:00 UTC, 12:00 UTC, 20:00 UTC), and will respawn a different set of 4 towers with 5 uses each.

Each type of crate rewarded the following Instamonkeys:
 * Wooden Crate (Tier-1) - 2 Instamonkeys, Tier-1 (high change) and Tier-2 (low chance)
 * Bronze Crate (Tier-2) - 2 Instamonkeys, Tier-1 (low chance), Tier-2 (high chance) and Tier-3 (low chance)
 * Silver Crate (Tier-3) - 2 Instamonkeys, Tier-2 (high chance) and Tier-3 (low chance)
 * Golden Crate (Tier-4) - 2 or 3 Instamonkeys, Tier-3 (high chance) and Tier-4 (low chance)
 * Diamond Crate (Tier-5) - 2 or 3 Instamonkeys, Tier-3 (medium chance), Tier-4 (high chance) and Tier-5 (low chance)

Candy rewards (2019)
TBA

Crate rewards (2019)
TBA