Rainbow Bloon

"Rainbow bloons are fast and mean, and have 2 blacks and 2 whites in them."

- Round 12 in Bloons TD 3

The Rainbow Bloon is a bloon that originally appeared in Bloons Tower Defense 2 and has appeared in every other BTD game since. It is the parent of two Black and White Bloons in BTD2 and BTD3, and the parent of two Zebra Bloons in BTD4, BTD5, and BTD6. Rainbow Bloons are quite fast, having a relative speed of 2.2 compared to a Red Bloon. They are faster than White Bloons but still slower than Ceramic Bloons. In the original Bloons, there is a Helium Bloon, which is also rainbow colored and is often confused with this type of bloon. It first appears on round 12 in BTD2 and BTD3 and on round 35 in later games.

Details
The Rainbow Bloon is one rank above Zebra Bloon (or Black Bloon and White Bloon prior to BTD4) in Bloons TD games. It is slightly faster than a Green Bloon and leaks 47 lives (37 lives pre-BTD4) if it reaches the exit. As per the multi-layer health system, a popped Rainbow Bloon splits into two Zebra Bloons when affected by an attack that deals 1 damage. More damage pops the Rainbows Bloon into its descendants, following the multi-layer health system of many bloons in the game. The Rainbow Bloon's parent is the Ceramic Bloon.

In Bloons TD games and Bloons Pop!, the Rainbow Bloon lacks any immunity but possesses offspring with relentless immunity against explosive and freezing. In most games, except BTD5 Mobile and other mobile counterparts, a Rainbow Bloon dealt with more than one damage can bypass explosion-immune and freeze-immune layers regardless of damage type of that attack. An example of this is Really Big Bombs popping a Rainbow into 8 Pink Bloons with an explosion dealing 3 damage, despite the explosion being unable to deal damage to Blacks or Zebras direclty.

Bloons Pop!
"High hit point Bloon"

- Short description

Combat
Rainbow Bloons are relatively strong bloons because, although its own layer is easy to pop, it can spawn a large total of bloons, summing up to 47 bloons per Rainbow Bloon. It is also relatively fast too, having a relative speed of 2.2 compared to a Red Bloon. Many towers or towers with high upgrades are well recommended to dealing with these bloons.

Super Ceramic behavior
In Rounds 86+ in BTD5, Rounds 30+ in both Bloons Monkey City Flash and Mobile, Rounds 35+ in BTDB Flash, Rounds 43+ in BTDB Mobile, and Rounds 81+ in BTD6, with the introduction of Super Ceramics, Rainbow Bloons will only spawn one Zebra Bloon when popped. Additionally, that Zebra will only pop into one White Bloon, and that White will only pop into one Pink Bloon, greatly reducing the total amount of child bloons in late-game.

Appearances

 * Pre-BTD4 generation games
 * Bloons TD 2
 * Bloons TD 3
 * BTD4 generation games
 * Bloons TD 4
 * Bloons TD 4 Expansion
 * Bloons TD 4 (Mobile)
 * Bloons TD 4 (DSi)
 * BTD5 generation games
 * Bloons TD 5
 * Bloons TD 5 Flash
 * Bloons TD 5 Deluxe
 * Bloons TD 5 Mobile
 * Bloons TD 5 Steam
 * Bloons TD Battles
 * Bloons TD Battles Flash
 * Bloons TD Battles Mobile
 * Bloons TD Battles Steam
 * Bloons Monkey City
 * Bloons Monkey City Flash
 * Bloons Monkey City Mobile (including Steam version)
 * Bloons Super Monkey 2
 * Bloons Supermonkey 2 Mobile
 * BTD6 generation games
 * Bloons TD 6
 * Bloons Adventure Time TD
 * Bloons Pop!
 * Bloons TD Battles 2

Round Appearances
The following are all appearances on each round where Black Bloons will spawn naturally from the entrance. These will not include the rounds where the Black's parents or subsequent parents will feature.

BTD2

 * Round X: TBA
 * Round X: TBA
 * Round X: TBA

BTD3

 * Round X: TBA
 * Round X: TBA
 * Round X: TBA

BTD4

 * Round X: TBA
 * Round X: TBA
 * Round X: TBA

BTD5

 * Round X: TBA
 * Round X: TBA
 * Round X: TBA

Normal Gameplay

 * Round 35: 35 Pink, 30 Black, 25 White, 5 Rainbow
 * Round 39: 10 Black, 10 White, 20 Zebra, 18 Rainbow, 2 Rainbow Regrowth
 * Round 42: 6 Rainbow Regrowth, 5 Rainbow Camo
 * Round 43: 10 Rainbow, 7 Ceramic
 * Round 45: 180 Pink, 10 Purple Camo, 4 Fortified Lead, 25 Rainbow
 * Round 48: 40 Pink Regrowth, 30 Purple Camo Regrowth, 40 Rainbow, 3 Fortified Ceramic
 * Round 49: 343 Green, 20 Zebra, 20 Rainbow, 10 Rainbow Regrowth, 18 Ceramic
 * Round 51: 10 Rainbow Regrowth, 15 Ceramic Camo
 * Round 52: 25 Rainbow, 10 Ceramic, 2 M.O.A.B.
 * Round 56: 40 Rainbow Camo, 1 M.O.A.B.
 * Round 57: 40 Rainbow, 4 M.O.A.B.
 * Round 62: 250 Purple, 15 Rainbow Camo Regrowth, 5 M.O.A.B., 2 Fortified M.O.A.B.
 * Round 65: 100 Zebra, 70 Rainbow, 50 Ceramic, 3 M.O.A.B., 2 B.F.B.
 * Round 70: 120 White Camo Regrowth, 200 Rainbow, 4 M.O.A.B.
 * Round 78: 80 Purple, 150 Rainbow, 75 Ceramic, 72 Ceramic Camo, 1 B.F.B.
 * Round 79: 500 Rainbow Regrowth, 4 B.F.B., 2 Fortified B.F.B.

Alternate Bloons Rounds

 * Round 26: 15 Black, 3 Zebra, 2 Rainbow
 * Round 32: 10 Purple, 5 Rainbow, 3 Ceramic
 * Round 34: 200 Green, 6 Rainbow
 * Round 38: 42 Purple, 17 Black, 14 Lead, 7 Rainbow, 1 Ceramic Regrowth
 * Round 39: 10 White Camo, 20 Zebra, 15 Rainbow, 2 Camo Rainbows
 * Round 42: 11 Rainbow Camo Regrowth
 * Round 43: 10 Rainbow, 2 M.O.A.B.
 * Round 49: 300 Yellow Regrowth, 10 Zebra Camo, 10 Rainbow Camo, 10 Rainbow Regrowth, 14 Ceramic Regrowth
 * Round 52: 35 Rainbow, 5 Ceramic Regrowth, 5 Fortified Ceramic, 1 M.O.A.B, 1 Fortified M.O.A.B.
 * Round 59: 50 Lead Camo Regrowth, 20 Fortified Ceramic, 25 Rainbow
 * Round 65: 70 Rainbow, 50 Fortified Ceramic, 3 Fortified M.O.A.B, 3 B.F.B.
 * Round 70: 200 Rainbow, 6 Fortified M.O.A.B.
 * Round 79: 500 Rainbow Camo, 4 Fortified B.F.B, 1 Z.O.M.G.

Bloons Pop!

 * Level X
 * Level X

Bloons TD 6
Rounds marked in italics are marked as technically starting to appear on that round but only ever appear from getting released from parent bloons.

Monkey vs Monkey (BMC)
Rainbow Bloons are unlocked by the Multilayer Tech upgrade. It costs 3500 and 5 to research at the Bloon Research Lab. In BMC Mobile, Multilayer Tech requires the Bloon Compression Tank.

Update History (Bloons TD Battles Mobile)
The Rainbow Bloon (specifically the grouped version) has become notorious among players for being hard to defend, especially when paired with the regrowth property, having earned the nickname Regrow Rainbows Of Doom (RROD). However, it's since been nerfed overall via game updates to make it more costlier and less effective to send.

?
 * Grouped Rainbow Bloons price increased ($450 → $675).

4.1
 * Grouped Rainbow Bloons price decreased ($675 → $550).
 * Grouped Rainbow Bloons spacing increased by 20%.

Quotes
"Check out this pretty bloon coming up..."

- Round 12 in Bloons TD 2

"At the end of the next round are 3 rainbow bloons. They contain 2 Zebra bloons, enjoy."

- Round 35 in Bloons TD 4

"Rainbow bloons, pretty fast, pretty mean, and pretty pretty. They're rainbows after all, right?"

- Round 35 in Bloons TD 5

"Ring a round the rosie, a pocketful of - Rainbow Bloons."

- BTD5 round 56

Trivia

 * It changed its appearance twice throughout the series. In Bloons TD 2 and Bloons TD 3, it has a red spiral, and looked like the Helium Bloon in Even More Bloons, while in Bloons TD 4, it has a vertical rainbow pattern. In BTD5 it was just different color lines that don't fade/collide together
 * In BTD3, it makes its first appearance before any of its children.
 * When an Ice Tower upgraded with Snap Freeze freezes a Rainbow Bloon, the Rainbow Bloon will pop leaving behind two Zebra Bloons in its place. Though they are immune to bombs and ice, the Zebra Bloons will be frozen. This one of the few known ways to freeze a Zebra Bloon, the other way is to use the Viral Frost.
 * If an Ice Tower pops a Rainbow Bloon with Snap Freeze in BTD5 (without Viral Frost or support of a Monkey Intelligence Bureau), the Zebra Bloons just come out unfrozen. The Zebra children will just move at their normal speed.
 * In BTD2 and BTD3, it is the only bloon to contain two different types of bloon, while in BTD4 and BTD5, it is the Zebra Bloon. In BTD6, the B.A.D. does too.
 * Although the Rainbow Bloon is a rainbow-colored bloon, it is not the parent of any bloon that is any color of the rainbow.
 * The Rainbow Bloon in Bloons Super Monkey only has 6 layers.
 * Before Round 35 in Bloons TD 4, the game tricks the player by saying there are 3 Rainbow Bloons at the end of the level. There are 3 Rainbow Bloons at the end of the level, but only after 5 are seen earlier in the level.
 * In BTD2, round 43's pre-round comment is misspelled and it says "Letting a raindbow bloon escape will cost you the princely sum of 37 lives!". "Princely sum" means a humorously large amount.
 * The official last appearance for Rainbow Bloons in BTD5 is Round 82, where Camo Regen Rainbows among with B.F.Bs incoming, though it wouldn't be a problem because camo detectors used in Round 78 can usually handle it, it also gives Ice Shards and Bloon Area Denial System ability come through it's spotlight since they can hit the B.F.Bs from behind.