Collection Event (BATTD)
Challenge maps have difficulty modifiers from other maps instead of their usual modifiers. Any map except Candy Graveyard, Cursed Mirrors, Fire Trap, Heirophant's Forest, or Infinity can appear in the event, even maps exclusive to premium Adventures. The modifiers are chosen at random from one of the following maps:
Special Gift
The Special Gift is an object that appears on the path on challenge maps. It will destroy the first non-MOAB-Class Bloon on contact, but if left intact, the gift will open and grant the player an additional reward upon completing the challenge map.
Rewards
Prizes
The rewards of each square on the grid is predetermined, but the order they are unlocked in is random. Opening all 24 of the prizes rewards one Legendary wish orb on top of the prize for the last square revealed.
// equipment can be a weapon, trinket, or ally, not sure if it includes powers or not
| Epic equipment | Super Rare equipment | Super Rare equipment | Rare equipment | Rare equipment | Uncommon weapon |
| Uncommon trinket | Uncommon ally | Common equipment | Uncommon weapon | Common trinket | Common ally |
 ×1
|
 ×1
|
 ×1
|
 100
|
50
|
10
|
 1,000
|
500
|
100
|
 200
|
100
|
20
|
Special Gift
| Difficulty | 40% | 40% | 5% | 15% |
|---|---|---|---|---|
| Normal | 10
|
×1
|
×1
|
Random character resource ×1 |
| Hard | 15
|
×1
|
×1
|
Random character resource ×2 |
| Extreme | 20
|
×1
|
 ×1
|
Random character resource ×4 |
| Impoppable | 25
|
×1
|
 ×1
|
Random character resource ×8 |