Events

Like many other games, Bloons games should also have Events in them. In an event (which occurs in certain period of times, like Christmas, Halloween, etc.), there maybe a theme change, an event boss, an event tower, discount on certain things, special mechanics, etc. whatever you can think of. Below are a list of events:

Christmas Event

 * Time: 24/12 - 27/12 (very short event!)
 * Theme change: Christmas theme
 * Tower changes:
 * Miss Claus' Tier 4 upgrades will be truly unlocked
 * The chance of a Dealer offering Miss Claus will be tripled
 * Miss Claus and her upgrades will be twice as effective
 * For visual effects, Miss Claus will have ice wings and television displays on the track
 * Bloon changes:
 * Defeating Genesis Bloon always gives you $25120
 * Genesis Bloon will have a new attack:
 * Holy Spirit: Recovers every bloon in the screen by 5 layers maximum
 * Track changes:
 * The Rink and Slalom will always snow, plus their appearance may change a bit
 * Event mechanics:
 * Monkey Claus will appear
 * Christmas Bell will be added on the main screen. It can be activated once a day. Once you use it, you'll get 3 random Special Agents that just came to help you.

Time Paradox

 * Time: 19/2 - 29/2
 * Theme change: Lots of clocks appear in the skies, some clocktowers will also be built in the town
 * Tower changes:
 * Time Leaper is twice as efficient
 * Having 5 active Time Leapers or more will make all bloons move slower by 5%
 * Bloon changes:
 * An event boss will appear: Gap Bloon!
 * Track changes:
 * Clock's clock hands will spin randomly in rounds instead of just spinning once before a round.
 * A new track will appear just in this event: The Clocktower!
 * Item changes:
 * The Epic item Antikythera only appears in this event! You can get it by defeating Gap Bloon!
 * Antikythera can in turn be used to craft the Chronopandemonium, an Epic Equip Item specially designed for Time Leapers!
 * Event mechanics:
 * You can control Day and Night however you wish in game. (If you want a round to be Day or Night, you can always just set it)

Halloween Event

 * Time: 24/10-31/10
 * Theme changes: The screen is darker and trees have no leaves, bats and pumpkins can also be seen.
 * Bloon changes:
 * P.U.M.P.K.I.N. have twice health.
 * Pumpkin Bloons have a 65% chance to release Candy.
 * Chocolate Bloons are replaced by Candy Bloons.
 * Track changes:
 * Same as theme changes.
 * Item changes:
 * Candy can be used!
 * Event mechanics:
 * It is always Night during the event.

Deep Sea Diving
(Coming not so soon)

Only fact known: An event boss will appear: Abyss Bloon!

Galactic Tour
(Coming lately)

Only fact known: An event boss will appear: Soleil Bloon!

Illusion Time

 * Time: 2/2, 3/3, 4/4, 5/5, 6/6, 7/7, 8/8, 9/9, 10/10, 11/11, 12/12
 * Theme changes: Half-transparent spirals may appear.
 * Tower changes:
 * Stun lasts 50% longer.
 * Hypno Monkeys are twice stronger.
 * Bloon changes:
 * Illusion Bloons replace Hypno Bloons.
 * An event boss is unlocked: Illusive Bloon!
 * Track changes:
 * The Illusion Rainbow track is unlocked!

Gateway to Minecraftia

 * Time: May 11th to May 17th, as well as November 18th (All important dates in the history of Minecraft)
 * Theme Changes: Projectiles become more blocky; Lasers become rectangles and Plasma becomes perfect squares.
 * Tower Changes
 * Mob Spawners cost 50% less, and can have up to 15 mobs on screen per spawner.
 * Piston Monkeys cost 50% less, and attack 50% faster.
 * Minecraft Monkeys (I hope the anon who made this is OK with me using this here) cost 60% less, and attacks 60% faster, with 10% greater range.
 * Bloon Changes:
 * B.E.D.R.O.C.K. and S.T.O.N.E. (Sorry Xander, hope you don't mind) are 10% stronger, but are 10% weaker against the changed towers.
 * Both S.T.E.V.E.s are 20% faster, but are 20% weaker to Mob Spawners.
 * Any remaining non-joke bloon in the category Minecraft stuff gets a 5% health boost and a 5% speed boost, but now are 10% weaker to the changed towers.
 * Track Changes
 * Coming soon!

Happy Valentines

 * All sweet-heart bloons appear! Love Bloon, Heart Bloon and Valentines Bloon on random rounds!
 * Love hearts appear randomly but rarely giving you 1 life!
 * Pesents fall down alot giving 13-47 cash!
 * Lover Lanterns can be craft along with Love Dust being dropped by all Bloons/Blimps!
 * More Comin Soon!

Palaeo-World

 * Time: April 4 - May 30 (Two very important dinosaur discoveries (Yutyrannus (feathered tyrannosaur almost as big as T. rex) and Aurornis (bird found predating Archaeopteryx) happened on those dates!)
 * Theme Changes
 * Pterosaurs can be seen flying through the sky; small dinosaurs run around in the menu; random howls will occur.
 * Tower Changes
 * Linheraptors and Radadactyls have double HP and a slight speed boost.
 * Hungry Hatzegopteryx, Kentrosaurus Wrangler, Tyrannosaurus rex, and Noisy Charonosaurus Special Agents unlocked.
 * Bloon Changes
 * Most normal bloons will be Dino Bloons (will add to the page later).
 * Track Changes
 * All desert or wasteland themed tracks will have random fossils partially buried in the terrain. The fossils are there for aesthetic purposes only.