http://static.tvtropes.org/pmwiki/pub/images/bloons-tower-defense-2_2851.jpg
[[caption-width:350:It looks so simple, doesn't it?]]

Before the rise of man brought the great rivalry between [[MemeticMutation Pirate and Ninja]], there was another natural feud between two animal species: Monkeys... and B[=[al]=]loons. No one knows how or why this epic war began, but both sides fight endlessly with ever greater wartime developments vying for domination of the world. All of the preceding is included absolutely nowhere in the game's design, and is merely a flavorful fantasy explaining why players seem to care so much about using monkeys to pop balloons.

''Bloons Tower Defense'' (or BTD as it's abbreviated) is an ongoing TowerDefense series by Creator/NinjaKiwi where monkeys (and other weapons) are used to pop a seemingly endless line of overly determined balloons of varying shapes, sizes, and speed. [[ArtEvolution Though starting out with a simplified design palette, later editions of the game have evolved to include a great deal of complexity in both art]] and gameplay mechanics.

This game was a spinoff of the lesser known ''VideoGame/{{Bloons}}'' (a series of aim-and-power-meter puzzle games with many player designed maps), but became so much more popular that this series got its own spinoff, ''VideoGame/BloonsSuperMonkey'' (a top-down aerial shooter starring the titular monkey from the [=BTD=] series).

A new game called ''VideoGame/BloonsMonkeyCity'' (which has elements of Facebook games where PvP is possible) is currently running in open beta.

All versions of the game can be played at [[http://ninjakiwi.com/Games/Bloons-Games/ NinjaKiwi's site]] and the original [=BTD=] (which is actually [=BTD3=]), [=BTD4=], and [=BTD5=] are available on the iPhone. A similar version of [=BTD3=] is available on DSiWare.
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!!The games provide examples of the following:

* AllYourPowersCombined: The Temple of the Monkey God will gain attacks and abilities related to all the towers sacrificed to it.
** For example, sacrificing a full power Ice Tower, Glue Gunner, Monkey Apprentice and Mortar will give the tower the ability to fire out exploding ice projectiles, corrosive glue blobs, giant tornadoes, and extra-powerful explosive missiles. All that along with the main EyeBeams.
* AndIMustScream: Presumably the eventual fate of a bloon, if left unpopped:
--> "If you were a bloon, wouldn't you rather get popped instead of slowly leaking and withering to an undignified husk? I guess we'll never know since they can't speak."
* {{Animesque}}: The artwork of the game has this look for some monkeys. ''ESPECIALLY'' the Ice Tower.
* AntiPoopSocking: "Remember to occasionally take breaks and do non-[=BTD5=] things."
* AreaOfEffect: The specialty of the Tack Shooter, Ice Tower, Bomb Tower, Mortar Tower, Monkey Ace...
* ArtEvolution: [=BTD2=]-[=BTD3=] used the same art for Bloons introduced in previous games, but the shift to [=BTD4=] improved the graphics, and the art drastically changed for [=BTD5=].
* AsteroidsMonster: Basically the whole premise of the game, and which sets it apart from most other "generic" [=TDs=]. EVERY SINGLE bloon does this except for the lowest tier. Short list from strong to weak in [=BTD5=]: Z.O.M.G. gives 4 B.F.B.s which give 4 M.O.A.B.s, which give 4 ceramic, which give 2 rainbows, which give 2 zebra, which give a black and a white, which each give 2 pink, and from then on only one comes out each time, going pink, yellow, green, blue, red. Additionally, there's also lead bloons that give 2 black.
** Also, if a bloon gets through your defenses, you lose lives equal to the total amount of bloons you let slip, meaning that if a blue one gets through, you lose two lives, but if a ceramic gets through, you lose 104 lives. And if you let a MOAB or higher through, the game ends instantly... under normal circumstances: [=MOABs=] take away 617 lives, [=BFBs=] 3164, and [=ZOMGs=] 16656. [[BribingYourWayToVictory Of course, if you bought that many lives, you likely also bought enough money to not need them.]]
* AwesomeButImpractical: The Monkey God Temple in 5 is a little half-n-half. It fires enormous beams capable of tearing anything less than a [=BFB=] to shreds, but it costs a whopping $125,000, since you have to buy laser, plasma, AND the Sun God to even access it. (And that's without the range powerups- counting those, the price goes up to $127,500.) It can also sacrifice any player-bought towers in its range & [[AllYourPowersCombined absorb their powers]], to the point of becoming powerful enough to down Z.O.M.G.s as though they were red bloons, but that means you need to pay for the absorbed towers (and you'll need a ton of money to get it to maximum power). Of course, this is normally only used in freeplay because of its high costs & although it is perfect for the rounds where bloons gain extra movespeed & health, there isn't anything forcing you to use it.
* BadAss: Super Monkey. Period.
** Also the Wizard Lord: Only appearing in one challenge level, it has the powers of both the Tempest Tornado & Dragon's Breath, plus it can summon its own special phoenix that [[BreathWeapon BREATHES LASERS]] and deals increased damage compared to the regular phoenix. Plus it ''can't be sacrificed by the Temple of The Monkey God''[[note]]although why you would ''bother'' with a Monkey Temple, given the circumstances of the challenge, is beyond mortal reasoning[[/note]]. However, it requires a sacrifice of the most expensive tower currently on the map every 2 rounds, otherwise you fail the mission.
* BeeBeeGun: The Beekeeper.
* BeamSpam / MoreDakka: Super Monkey? Meet Sun God Monkey. Sun God Monkey? Meet [=BTD5=]'s Temple of the Monkey God.
** Also the Robo Monkey, which shoots 2 per frame to the Sun God's 1.5. Also its upgrade, the [[spoiler:Technological Terror]]. It fires the same amount of beams as the Robo Monkey, but its plasma is green & extremely deadly: a single stream of this green plasma is twice as deadly as a single stream of the regular purple plasma, but since it fires 2 streams of it...
** And the Dartling Gun's Laser Cannon upgrade. The one after it turns it into a WaveMotionGun.
* BearsAreBadNews: The Beekeeper is a bear. Good to know that he's on your side.
* BerserkButton: The Angry Squirrel, who goes berserk whenever a bloon leaks. His pro version gets a ''worse'' anger management problem, and it now gets pissed every 20 acorns it throws.
* {{BFG}}: Take your pick... Nearly any tower becomes one of these when fully upgraded.
** There's also the original monkey temple, which fires ''3 times as fast as a single Sun God'' when activated. Its activated by sacrificing at least $30,000 money & 40 towers to it.
* BigBulkyBomb: The icon for the Ground Zero ability has this.
* {{Bishonen}}/SamusIsAGirl: The Ninja Monkey seems very feminine in the artwork, and its attack animation seems feminine. This has led to some players WildMassGuessing about his/her gender.
* BlatantLies: In [=BTD5=], unless you don't have a great defense.
-->Next level will be fun. A whole bunch of ceramic bloons are going to charge right through your defenses and pretty much make you lose.
* BlowYouAway: The Monkey Apprentice gets this quite literally with the Tempest Tornado upgrade, allowing him to blow Bloons back towards the start. Same thing with the Heli Pilot's Downdraft upgrade.
* BoringButPractical:
** Banana Farms are expensive and don't attack Bloons, but they give you extra money, which you will need in later levels when the Bloons themselves earn you less money.
** Starting a level with a dart monkey in 5. It may not scale as well as other towers, but in the beginning it's very safe, as you can upgrade it to see camo and if you don't plan on bringing it into the later levels throw up to 3 darts, which will do good damage to normal bloons. It will easily get outclassed, but in the beginning it's pretty steady.
** The Glue Gunner: At first, it is a no damage-dealing tower which slows bloons, but when you upgrade it, the glue basically instakills any bloon it hits.
** The Spike factory: simple and boring; no moving parts, just a constant stream of small piles of tacks. But it can be upgraded to pop lead bloons, there's a special option for ceramic bloons, and it kills [=MOABs=] more quickly than a Super Monkey.
** Finally the dartling gun. It's a rapid fire dart gun that is generally only obtainable mid-game. Why is it boring? You manually aim it with your mouse. Not only does it have the longest range of the towers because of that, but it also helps avert the rather infuriating issue of a single, or few, lone target out of the range of any tower, because you can just turn to shoot it.
* BossInMookClothing:
** M.O.A.B.s, natch. To wit- they contain four ceramic bloons, each of which contain two rainbow bloons, which were the highest Bloon rank in [=BTD3=]. Furthermore, they cannot be slowed down and are resistant to the Super Monkey Storm.
** Ceramic bloons can also be considered as this, as they take more hits to destroy than any other bloon (other than the M.O.A.B.-class bloons). All weaker bloons can only take ''one''. BTD 5 notes that it takes ''eighteen'' shots to drop a single ceramic to completely popped. Eight of those are just to ''crack the shell''. Unlike MOAB-class bloons, they are very fast too!
** And then there are B.F.B.s. Even more health than the M.O.A.B. and also cannot be slowed down. They ''contain'' M.O.A.B.s.
** Bloons Tower Defense 5 has an even bigger unit than the B.F.B. (the ZOMG Bloon). They ''contain'' B.F.B.s.
*** To elaborate: Zomg contains 4 [=BFBs=] contains 16 [=MOABs=] total contains 64 ceramics contains 128 rainbows contains 256 zebras contains 256 blacks and 256 whites contains 1024 pinks contains 1024 yellows contains 1024 greens contains 1024 blues contains 1024 reds. CHRIST, man!
* BossRush: Level 75 of [=BTD4=], the final level of Hard mode on any course.
** BlatantLies: The final round is described as being "This is the true final level. You know it's going to be all B.F.Bs and M.O.A.Bs right?". There are lead bloons clearly visible between the Blimps.
* BribingYourWayToVictory: In the 5th game. [[TropesAreNotBad by no means required]], the game is perfectly playable and winnable without buying any of the upgrades, but there are a lot of options for outright breaking the game for the payment of real money. They range from simple upgrades, such as dart monkeys getting an area of effect on the dart, which simply give towers more versatility or firepower, to buying ingame money (both monkey money and the cash required for upgrading towers) as well as health. [[TropesAreNotBad Again, winnable without them]], you're just buying cheat codes, and in fact some players prefer the challenge that the base game offers in the first place.
* BulletSeed: The Watermelon Spitter Special Agent.
* BulletHell: The Aircraft Carrier's bread and butter is making this.
* ContractualBossImmunity: M.O.A.B.s and B.F.Bs are immune to slowing down as well as the [[SmartBomb Super Monkey Storm]] (otherwise a OneHitKill).
** In [=BTD5=], there are a few special abilities which do nothing except for destroy a single M.O.A.B.-class bloon. However, the Z.O.M.G., while not completely unaffected, will only take 1000 damage.
** The Super Monkey Storm in [=BTD5=] used to subvert this as they '''did''' destroy everything on screen, including Z.O.M.G.s. However, you have to use Monkey Money to buy it, and it can only be used once per buy. Unfortunatly, a patch made so that Z.O.M.G.s take only 1000 damage from those as well.
* CoolAirship: Appearing as [[BossInMookClothing Bosses in Mook Clothing]]!
* CoolBoat: The newest tower on the mobile version, the Monkey Sub, is this. It can be upgraded to either become a support tower, or have an ability that can OneHitKill ''[[PurposelyOverpowered A Z.O.M.G.]], [[OneHitPolyKill and do the same to any nearby bloon!]]''
* DoomyDoomsOfDoom: One of the Daily Challenges for [=BTD5=] was called Rainbow Rush of Doom.
** There is also the [[MeaningfulName Ray of Doom]], which can destroy ''any & all'' non-Z.O.M.G. bloons in seconds.
* DoubleUnlock: In [=BTD5=], you unlock a weapon's upgrade path via having a high enough rank, AND the tower class needs to be at a high enough level.
* EasyModeMockery: The picture for easy mode [=BTD4=] onwards is a baby monkey.
** {{Subverted}} on Extreme difficulty tracks on [=BTD5=]. The Easy mode is ''merely'' a Point Five Oh Sniper Monkey, the Medium being a Ray of Doom Monkey, and the Hard mode is a Sun God Monkey. You know it's Extreme when the easy mode pic is a BadAss (although not as badass as the other two).
* EverythingsBetterWithMonkeys: A basic tenet of the game.
* EverythingsBetterWithPlushies: Well, there is only one: the Super Monkey. [[http://www.ntensify.com/bloons/super-monkey-8-limited-edition-plush/ You can buy it here]].
* EverythingsNuttierWithSquirrels: The [[ExactlyWhatItSaysOnTheTin Angry Squirrel.]]
* EyeBeams: The Super Monkey uses these as an upgrade.
* FloatingContinent: The Floating Islands and Ascension tracks feature these, but the islands in Ascension [[BubblyClouds are clouds]].
* FunWithAcronyms: The M.O.A.B., also known as Massive Ornary Air Blimp. As for B.F.B., it's Brutal Floating Behemoth.
** And the Z.O.M.G. is the Zeppelin Of Mighty Gargantuanness.
** One stage in [=BTD3=] has the hint "MOAB stands for Massive Ornary Air Blimp, not Mother Of All Bloons. Either way, it brings pain."
*** The {{Irony}} of that last description was that it was used in Bloons Tower Defense 3, where the M.O.A.B. ''was'' the mother of all bloons. Nowadays, its the weakest MOAB-class bloon in the TowerDefense series. The Mini Moab from VideoGame/BloonsSuperMonkey is even weaker, but it currently only appeared in the 2nd game for ''that'' series.
* FuumaShuriken: The Boomerang Throwers can be upgraded to use these, as of [=BTD3=]. In [=BTD5=] and the spinoff game ''VideoGame/BloonsMonkeyCity'', they can also upgrade to [[PrecisionGuidedBoomerang HOMING fuuma shuriken]], and then get two of them that ''permanently rotate around them, shredding anything that gets close.''
* {{Fragile Speedster}}: Pink and Yellow bloons. They are the only bloons in the entire series that are faster then the Ceramic Bloon.
* GoldenSuperMode: The left path of the Super Monkey.
** SupernaturalGoldEyes
** For that matter, the last half of the left path is technically the GoldenPath. Both upgrades are gold, and both are {{Badass}}.
* HarderThanHard: Extreme Mode in [=BTD5=] is a map difficulty reserved for what are usually considered the two hardest maps ingame, Main Street and Bloontonium Lab. (Both unlocked at Rank 50 and Rank 60 respectively) The maps cost a fee of either 25 Monkey Money or 50 Monkey Money per play depending on the map you choose and will reward you with [[BraggingRightsReward insanely large amounts of XP and an achievement worth many Awesome Points.]] Playing these maps can be a big risk if you plan on investing lots of Monkey Money into [[BribingYourWayToVictory upgrades, Specialty Buildings, and Special Agents.]]
** Version 2.8 of the mobile ports give us Im[[IncrediblyLamePun pop]]pable mode. Towers and their upgrades are very expensive (including their sell price being reduced), the bloons move even faster, [[BossInMookClothing MOAB-Class Bloons]] are absurdly strong, and your kingdom becomes a OneHitPointWonder. Speaking of the latter, it's impossible to have more than one life. [[spoiler:Also, there are 5 Z.O.M.G.s on Round 85 just to screw you over, and they are already LightningBruiser[=s=].]]
* HelicopterBlender: The Heli Pilot can be upgraded to use this.
* HumongousMecha: The Technological Terror is pretty big compared to most other towers, and it's a robot.
** It is also very powerful compared to most other towers. A single stream of its green plasma is like 2 streams of the regular purple plasma rolled into 1, & it fires 2 of them, effectivly dealing as much DPS as [[NoKillLikeOverKill 4 Plasma Monkeys]]. Plus, a single stream of it can pop 5 bloons per shot, the left path upgrades increase its pierce rate. In short, it is stronger against M.O.A.B.s then even the ''Sun God'', & stronger still then the ''Ray of Doom''.
*** Against swarms of regular bloons though, the other mention towers make it look worthless by comparison, because the Sun God's beams spread apart the further they travel & the Ray of Doom's destructive beam can destroy even large swarms of ceramics in seconds. They also have superior popping power to boot.
* TheGoomba: Red Bloons.
* GuiltBasedGaming: Message when you try to quit a level: "If you quit, [[TheBadGuyWins the bloons win]]!"
* HazmatSuit: The Glue Gunner starts wearing one once his glue starts splashing or gets corrosive.
** Mortar monkeys will get one when you upgrade to Bloon Buster.
** Dartling Gunners will also start wearing one once you upgrade to lasers.
* KillSat: The Bloonsday Device.
* ThereIsNoKillLikeOverkill: "Overkill" doesn't seem to be a word in the monkey vocabulary..at all..
* InvisibleMonsters: Camo Bloons aren't really invisible, but most towers will not be able to detect them unless there is a specialized tower nearby.
** However, several towers in [=BTD5=] can be upgraded to have camo detection, while the Ninja Monkey, Spike Factory, and Dartling Gun already have this.
* TheJuggernaut: The ZOMG. You can't Nuke It, but must kill it with 4000 cuts.
** Lead Bloons if you don't have appropiate defenses- not even a whole map of Aircraft Carriers can scratch it. However, just one explosive will do the trick.
* [[LinearWarriorsQuadraticWizards Linear Towers, Quadratic Farms, Exponential Snipers]]: Towers Pop Bloons and get money, Banana Farms produce a fixed amount of money, each round, for more farms. Supply Drop Snipers Activated Ability work over time, and rounds get reaaally long on Freeplay.
** Don't even start on the iOS Support Chinook helicopters. Not only do they drop money with a time-based Ability like the snipers, but they also have a decent attack, can freely move towers around, and drop med crates. In a game where the only other sources of healing your life are the Health Injection, which costs Monkey Money, and Healthy Bananas, which costs real world money and heals much less.
* LightningBruiser: [[EliteMook Ceramic Bloons]] can take a lot of damage to pop, but unlike the understandably [[MightyGlacier slow]] [[BossInMookClothing M.O.A.B.s, B.F.B.s and Z.O.M.G.s]], they are ''fast''. Did we also mention that they do 104 damage to you, which is a OneHitKill on Hard and a two hit kill otherwise?
** The LightningBruiser of the MOAB-class is the original MOAB, which can take even more damage then the Ceramic bloon(& also holds 4 Ceramics) & moves faster then the stronger blimps(which are so much stronger).
** Actually, all MOAB-class bloons become [[LightningBruiser Lightning Bruisers]] later on, because the bloons eventually start to speed up, so you might encounter Z.O.M.G.s that are as fast as pink bloons!
*** However, Z.O.M.G.s are already this in [[HarderThanHard Impoppable Mode]], as soon as they initially appear, which is, of course, round 85.
** For the monkeys, we've got the Super Monkey: it fires quickly, has good range & kicks a whole lot of ass. It becomes that much more powerful & [[RuleofCool awesome]] when upgraded...
** Also, for the monkeys, there is the Heli Pilot on Pursuit Mode, which actively chases down bloons.
** [[RuleofThree Yet again, for the monkeys]], we have the Spectre, which fires darts and SMALL NUKES rapidly!
* MacrossMissileMassacre: The Bloon Area Denial System ability of the [[GatlingGood Dartling Gun.]] Do we have to say any more?
* MagikarpPower: As a rule of thumb, towers which are unreliable when non upgraded end up having the best upgrades:
** The Tack Shooter. In the beginning, they really CantCatchUp. Once you unlock Ring of Fire or Blade Maelstrom, however...
*** Blade Maelstrom has infinite piercing power. [[[Infinite INFINITE]]
*** However, [[AchillesHeel Lead Bloons]] will stop the blades dead in their tracks.
**** Subverted if said Blade Shooter is under the influence of an MIB. However, it still cannot hit [[InvisibleMonsters Camo Bloons]], even if under a Monkey Beacon.
** The Monkey Apprentice starts out with the same power as a Dart Monkey and more than twice as expensive, but once fully upgraded it casts enough types of spells to do the work of four towers at once.
** The Ace Pilot and Boomerang Throwers are sort of random and will rarely hit more than a couple bloons unless they're lined up right...until their shots either gain homing abilities or [[MoreDakka shoot so fast]] that they'll hit all bloons no matter what.
** Dart Monkeys in [=BTD5=]. They are towers that might be pathetic. Then you use the Super Monkey Fan Club Ability...
** Also, the Glue Gunners. They start out doing nothing more than slowing bloons down for a brief period of time, but when you unlock Corrosive Glue, they go from being merely a way of slowing things down to downright deadly.
** Even [[MetaPowerup Monkey Village]] joins in the fun for its left upgrade path, which gives its radar a deadly lightning attack that does a lot of damage.
* MarkedBullet: The Spectre's artwork in [=BTD5=] features two mortars marked with "TO: BLOONS; FROM: ACE".
* MetaPowerup: In [=BTD4=]/[=BTD5=] the banana farms/plantations/republics/research facilities give the player extra money after they complete a level.
* MutuallyExclusivePowerups: [=BTD5=] lets you pick 2 upgrades on each path, and 2 more on either path 1 or 2.
* NiceHat: Several towers either have this by default, or can be upgraded to have either this or HairDecorations.
* NonIndicativeDifficulty: Discussed in BTD3's pre-round comment.
-->"Some tracks are hard on easy, and others are easy on hard. Ain't life funny."
* NoSell: Black Bloons are immune to explosives, White Bloons cannot be frozen, Zebra Bloons have ''both'' the properties of black and white, and Lead Bloons cannot be damaged by sharp objects (And Super Monkey/Laser Cannon lasers, but Plasma and the Sun God can, since [=BTD4=]). The M.O.A.B and B.F.B are [[ContractualBossImmunity immune to anything that slows them down]], as well as the [[OneHitKill Super Monkey Storm]] (in 3 and 4). The Z.O.M.G. will merely take 1000 damage from one of the Bomb Tower's M.O.A.B. Assassin ability in [=BTD5=].
** Super Monkey Storm used to avert this in 5, as it used to destroy everything (Including Z.O.M.G.s) in one use. However, you only get one use per game! Due to a patch, however, Super Monkey Storms now only do 1000 damage to Z.O.M.G.s.
* NumberOfTheBeast: 616 is the RBE of the Massive Ornary Air Blimp in the fifth game.
* NukeEm: The Monkey Ace's Ground Zero special does this. It destroys '''EVERYTHING''' on the screen except Z.O.M.G.s.
** Ground Zero was nerfed and now requires two uses in order to kill full health BFBs. This {{Nerf}} is present in BloonsMonkeyCity.
* OhCrap: Watch the end of the BTD 5 trailer...
** Also, if you don't have good camo detection, round 42 also applies to this.
* OneHitKill: The Super Monkey storm. Works on everything except for M.O.A.B-class bloons in 3 and 4. In 5, it is played straight, except for Z.O.M.G.s.
** If a M.O.A.B.-class bloon slips through your defenses, you instantly lose. Those things will eat up your remaining stock of lives.
*** Heck, one Ceramic bloon is enough to kill you on Hard. Otherwise, they're a ''two'' hit kill.
** Plus,the M.O.A.B. Takedown ability in [=BTD5=] will reel in a bloon, the strongest being the B.F.B. (They are supposed to aim at M.O.A.Bs and B.F.Bs).
** The Technological Terror can execute a shockwave powerful enough to destroy EVERYTHING that isn't a Z.O.M.G. in its radius.
** The Monkey Ace's Ground Zero ability does the same as the M.O.A.B. Takedown ability, only that it hits the ENTIRE SCREEN.
*** Nerf: Ground Zero can no longer destroy BFBs in one hit, at least in BloonsMonkeyCity. They are still instant death to BFBs in Bloons Tower Defense 5 deluxe.
* PainfullySlowProjectile: M.O.A.B. Class Bloons are [[MightyGlacier extremely slow]]. And a good thing too, because they are ''[[OneHitKill very painful]]''.
** Also, the darts fired by Monkey Aces.
* PlayerVersusPlayer: ''Bloons TD Battles'', where you battle another player and can send extra bloons to harass them further.
* PrecisionFStrike: Round 14's tip on the Super Monkey. Also round 63 of [=BTD5=]
* PrecisionGuidedBoomerang: Actually averted with the Boomerang monkeys, their boomerangs go in a set circular path. (although they will try to throw it at the bloons). Played Straight with Glaive Ricochet (3rd upgrade, 1st path), glaives bounce from bloon to bloon.
* PteroSoarer: The Radadactyls in [=BTD5=] appear to lack pycnofibers and have batlike wings. And a crest like a Pteranodon's. It's [[UpToEleven especially prominent]] in the Pro version.
* RegeneratingHealth: [=BTD5=] gives us Regenerating Bloons: Heart-shaped bloons which, if left unpopped, restore themselves to their original color.
* RPGElements: For most of the series, you only needed enough money to afford the next upgrade. With [=BTD4=], ranks must be earned to unlock all of the towers and top tier upgrades.
** In [=BTD5=], however, all upgrades and towers must be unlocked. Both can be unlocked through rank-up, but a tower will need experience in the case of the former. Another case of the former is that rank-up only unlocks the final upgrades of the towers.
* SerialEscalation[=/=]PowerCreep: In [=BTD1=], the strongest bloons were Black Bloons and White Bloons. In [=BTD2=], the strongest bloon was the Rainbow Bloon, which contained 2 Blacks and 2 Whites. IN [=BTD3=] me meet the first real "boss" the MOAB which is a instant game-over if it leaked and had 4 [[EliteMooks Ceramic Bloons]] (each contains 2 rainbows) in it, [=BTD4=] introduces the [=BFB=], which a larger version of the MOAB with 4 MOABS in it and now in [=BTD5=] theres the ZOMG, which is a [[UpToEleven even larger bloon with 4 [=BFBs=] in it]]! Fortunately, the monkeys have got even stronger:
** In [=BTD1=], Dart monkeys only had long range darts and one extra pierce as powerups. Now? They can get either SpikeBallsOfDoom that crush bloons in their path or temporarily turn into Super Monkeys.
** [=BTD1=] Tack shooters had the ability to shoot tacks faster, and with better range... and that was it. Now they get the ability to fire out a deadly flaming ring or the ability to create a StormOfBlades.
** [=BTD1=] Bomb towers had bigger explosions and longer range as powerups. Now they have a cluster stun bomb ability or the ability to kill MOAB bloons quickly.
** [=BTD1=] Super Monkeys only had an extra range upgrade. In 2, they gained the ability to shoot EyeBeams. In 3, they got the ability to shoot ''plasma'' eye beams. 4 allowed them to become Sun God monkeys. Now? They can either become a terrorizing death machine with dual arm cannons and an InstantDeathRadius ability, or an even stronger god temple which has the ability of AllYourPowersCombined and crazy damage output.
* SentryGun: The Tack Shooters are Type 3, the Bomb Towers Type 2, and the Monkey Engineer's [[ExactlyWhatItSaysOnTheTin Sentries]] are Type 1.
* ShoutOut:
** In [=BTD4=]:
*** Operation: Dart Storm's description:
-->[[Film/ThreeHundred Our darts will block out the sun.]]
*** The [[HarderThanHard Extreme]] tracks of the mobile port have [[Film/BackToTheFuture 1.21 Gigapops!]], [[VideoGame/PlantsVsZombies Monkeys vs. Bloons]], [[Film/{{Moonraker}} Bloonraker]], and [[Literature/MobyDick MOAB-y]] [[Film/{{Jaws}} Dick]]. Jolly Roger is the only one that's not a ShoutOut.
** In [=BTD5=]:
*** The Monkey Engineer is an obvious VideoGame/TeamFortress2 reference. It can even produce [[SentryGun little, green, automatically-firing turrets!]]
*** The FuumaShuriken that the Boomerang Throwers can be upgraded to use are referred to as "[[Film/{{Krull}} glaives]]".
* SmartBomb: In [=BTD3=] and [=BTD4=],the Monkey Beacon can be upgraded to call in a bunch of super Monkeys, which insta-kill every single bloon on the screen. Except [[ContractualBossImmunity M.O.A.B-class bloons]].
** In [=BTD5=], this same thing appears as a Special Agent, and it wrecks everything but Z.O.M.G.s.
** The Ground Zero ability for the Monkey Ace does this (Now requiring two uses to destroy BFBs), and takes it quite literally
* {{Snowlems}}: The Mad Snowman, and (arguably) the Ice Tower.
* SpikesOfDoom: Tacks/road spikes can be placed on the floor, and will do pop 11 bloons before disappearing. The Spike Factory will periodically place spikes on any section of path in its radius- making less need for road spikes.
* SpikeBallsOfDoom: The spike catapult launches these.
** The Spike Factory can be upgraded to produce these. The next upgrade makes the spike balls MadeOfExplodium & causes the factory to [[{{Understatement}} produce them at a fast rate]].
* SplashDamage: Many upgrades give towers this ability, but Tack Towers and Cannons have it as their bread-and-butter.
* SpreadShot: Sun God Monkeys have a rapid piercing 3-way eye beam, while Monkey Buccaneers can be upgraded to have a 5-way shot, the regular dart monkey can have a 3-way shot, and the dartling gun can be upgraded into this in the missile line
* StandardStatusEffects: While most towers are designed only for destruction, a few specialized abilities are required by some.
** Cannons and other explosives are needed to pierce Lead Balloons.
** Ice Towers can freeze bloons in place, and even slow them down permanently with the Permafrost upgrade.
** Glue piles (and in later versions Glue Gunners) slow down the fast-moving bloons that spell instant death.
** Glue Gunners with corrosive glue can also give the bloons an effect similar to poison, while slowing them down at the same time.
** Radar towers expand the range and fire rate of towers, as well as allowing them to see camo bloons.
** Upgraded mortars [[KillItWithFire set bloons on fire]].
* SymbolSwearing: Round 63 for [=BTD5=]: "Next round will be @#$*% hard."
* UnexpectedShmupLevel: The Direct Assault Mission, in a nutshell.
* TechnicolorToxin: Bloon Dissolver and Bloon Liquefier glue are green in colour.
* TechTree: Sort of. [=BTD5=] handles upgrades differently to the previous games - each tower now has two upgrade paths that can be chosen from. You can go two upgrades down both paths without penalty, but after you pick a third upgrade from either, you can no longer go beyond the second upgrade from the path you didn't pick.
* TheTetrisEffect: Best to stay away from carnivals and parties after playing this game for too long.
* TurtlePower: The Tribal Turtle.
* VideogameFlamethrowersSuck: Subverted with the "Dragon's Breath" upgrade for the Monkey Apprentice, which does massive amounts of damage per second & makes for a great defense when saving up money. As of nowadays, it also doesn't remove the apprentice's other spells(except the fire ball attack).
* WaveMotionGun: The Ray of Doom, Bloonsday Device, and (arguably) the Sun God and Temple of the Monkey God.
* WeaponofMassDestruction: The Temple of the Monkey God is one the most extreme weapons one could ever see. It sacrifices all towers in its former radious when upgrade, but also gets their powers. In fact, when given the max sacrifice ([[spoiler: 3 Big Ones, 1 Master of Air, 1 Bloon Liquifier, 1 Arctic wind & 1 High energy beacon or MIB Call to Arms, & 1 Technological Terror if you like]]), can destroy any bloons that the game currently has, including ''Z.O.M.G.s''.
** With a tier 4 Super Monkey Lair in the moble version of BTD5, it becomes ''even more powerful''. The reason is because the 4th tier SML gives the temple an ability that doubles the firing speed for all of its powers & grants it extra range for 10 seconds. In short, this ability turns the Temple into even more of a GameBreaker when activated.
** The Technological Terror is less powerful then a near max temple, but still pretty darn effective. It fires 2 streams of green plasma(each one being twice as powerful as the regular purple plasma) & has a lethal ability called the "Bloon Annihilation", which generates a short ranged force-field that does 1000 damage to all MOAB-class bloons next to it.
** There is also the [[MeaningfulName Ray of Doom]], which shoots a constant solid beam of bloon destruction with a pop rate of ''100'', practically killing any & all regular bloons in less then a second. The problem though, is that it is notoriously weak against MOAB-class bloons, since it only pops 1 per frame for those. Even so, a single one is still pretty effective against the M.O.A.B.s & B.F.B.s, but the Z.O.M.G.s are another story...
** The Alternate option competing with the Ray of Doom, the Bloon Area Denial System, which fires 3 dart-tipped rockets that do splash damage and can kill any type of Bloon every shot, it's an Dartling gun upgade and keeps all the rate of fire and upgrades to said rate of fire. Oh, and it has a special ability, namely ''firing a rocket at the 100 closest bloons'' and repeating for 5 times. This is probably as many rockets as filing the entire screen with rocket turrets can barf out.
** Both final upgrades for the Monkey Ace: the Spectre which rapidly fires darts '''&''' hydra rockets directly at the bloons & the Operation Ground Zero, which grants the ability which can be used to clear the screen of bloons.
** The Spiked Mines Factor: It fires at an ''extreme'' rate & its spiked balls explode when they reach their pop cap, which happens to be 16 bloons. Since its downgrade is the Spiked Ball Factory, its spikes also deal 3x as much damage to ceramics & MOAB-classers as regular spikes.
** The Apache Dartship fires darts at the bloons like a machine gun & also fires a quad-storm of rockets every couple of seconds. Its downgrade also allows it to pop bloons with the blades that it uses to fly with.
** The [[KillSat Bloonsday Device]], which has the ability to activate the powerful beam from a satelitte which soars high above the maps. Its pro variation is [[UptoEleven even more epic]], because its beam leaves energy tacks in its wake.
** The Aircraft Carrier launches up to 3 mini-aces at a time. These mini-aces fire 2 streams of datrs & the Monkey Aces trademark 8-dart spread fire. They are great at popping bloons from all around the track.
* WeaponsThatSuck: In the offline ("Deluxe") and mobile versions of [=BTD5=], one of the new weapons is the Bloonchipper. It doesn't do damage very quickly, but it can keep a number of bloons permanently busy as even if they survive the first trip through its vacuum will just lock on to them again before they resume normal travel (provided your other towers don't pop them as soon as they're viable targets). One of its upgrade lines ultimately lets it chew on M.O.A.B.s.
* XMeetsY: Bloons meets the tower defense genre.
* YouAreAlreadyDead: Corrosive Glue or higher acids, on Bloons (Unless they make it through). The Bloon Liquefier will MURDER anything ceramic or weaker if it gets its glue on them.
** It's literally suicide for a bloon below B.F.B. rank to approach a max temple.
* YouWillNotEvadeMe: The Ice Tower's Arctic Wind slows down the bloons, allowing the Snap Freeze effect to torture them to the last layer.
* ZergRush: Sorta of the entire methodology of the Bloon hordes; each higher grade bloon contains so many of the next class down. Sending a whole bunch at one time is what amounts to "difficulty" in the game.
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