Bloons Tower Defense Unleashed

Bloons Tower Defense Unleashed is another Bloons Tower Defense where Boss Bloons return and also introduces several new bloons.

Towers
See it's own section.

Heroes
All heroes from BTD6 return for BTD Unleashed, additionally having some new ones.
 * Darkseum the Black Magic Wizard Makes use of some powerful magic to help other monkeys and pop bloons.
 * Axel the Operator Uses a machine he himself created that has a few hidden tricks.
 * Professor M. Monkey Combines dangerous effects that pops and make the bloons weaker.

Boss Bloons
The boss bloons return in this game, appearing in special occasions. When they appear, a message will pop up at the screen saying "X is attacking Monkey City!". After the player has seen this message, a long countdown will start and have the same effect as losing against the boss bloon when running out of time, which is losing a considerable amount of Monkey Money and at least one of each bought item. If the player loses, they have another final chance to fight the boss bloon. Winning gives the player rewards, and the defeated boss bloon will now start appearing in the normal game mode.

Outside of the defend events, boss bloons take turns to appear every 40, 30, 20, or just 10 rounds starting from Round 110 as long as they've been defeated before on their specific events.