[[quoteright:350:http://static.tvtropes.org/pmwiki/pub/images/bloons-tower-defense-2_2851.jpg]]
[[caption-width-right: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 ''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 game called ''VideoGame/BloonsMonkeyCity'' (which has elements of Facebook games where PlayerVersusPlayer is possible) is currently running in open beta. Another game called ''Bloons TD Battles'' (where [=PvP=] is the primary focus) also exists.

All versions of the game can be played at [[http://ninjakiwi.com/Games/Bloons-Games/ NinjaKiwi's site]], and the original [=BTD=], [=BTD2=], [=BTD3=], [=BTD4=], [=BTD5=], BTD Battles, and Bloons Monkey City are available on the iPhone. A similar version of [=BTD3=] is available on UsefulNotes/DSiWare. Ninja Kiwi has confirmed that they're working on a sixth game in the series [[https://www.prlog.org/12629600-ninja-kiwi-announces-bloons-td-6-in-development.html here]].
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!!The games provide examples of the following:

* AllegedlyFreeGame: Downplayed. While there is a good bit of premium content, you can play the game very well without them. The Steam version of 5 has no premium content although you have to spend $10 on it.
* 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 (ceramic and blimp layers also count as lives lost), meaning that if a blue one gets through, you lose two lives, but if a ceramic gets through, you lose 104 lives.
* 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[[note]]On Medium, the prices on other difficulties (From Easy to Impoppable (still including Medium)) are $106,250/$125,000/$135,000/$150,000. Either way, you're still not going to get it for quite a while. There is also the Monkey Village, which lowers the prices by 10%, but it's still (Easy-Impoppable) $95,625/$112,500/$121,500/$135,000[[/note]], 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 will also sacrifice any player-bought towers in its range and [[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 and health, there isn't anything forcing you to use it.
** Distraction by Ninja Monkeys might provide a great reversing power, but if you only rely on them without others while facing Regens, you're facing an endless army that will make you lose.
* BeeBeeGun: The Beekeeper.
* BeamSpam:
** 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 and 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. It is activated by sacrificing at least $30,000 money and 40 towers to it.
* BigBulkyBomb: The icon for the Ground Zero ability has this.
* {{Bishonen}}: The Ninja Monkey seems very feminine in the artwork, and its attack animation seems feminine.
* 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 can kill [=MOABs=] more quickly than a Super Monkey.
** 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.[[note]]One of BTD5's T4 upgrades lets a sniper effectively freeze a single M.O.A.B. in place until it's popped. Not only that, but the power of the shots will send the bloons it contains to blue instantly, as long as it lands the final blow. This makes it the easiest of the bosses[[/note]]
** 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 [[note]] Although just like the M.O.A.B., the sniper can effectively stunlock a single B.F.B.[[/note]] . 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. [[note]] Unlike the previous two, these recover from the snipers stunlock fast enough so that while it's slowed down, it still advances[[/note]]
* BossRush: Level 75 of [=BTD4=], the final level of Hard mode on any course.
* {{Bowdlerise}}: The Cool Math Games version of the first game changes a pre-round message about the Super Monkey from "he really kicks ass!" to "he is really [[{{Badbutt}} poptastic!]]".
* BribingYourWayToVictory: In the 5th game, 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.
* 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 and 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|Trope}} 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]].
* EyeBeams: The Super Monkey uses these as an upgrade.
* FatalFlaw: The Super Monkey is easily the most powerful monkey in the series. It also cannot target Camo bloons, unless it gets upgraded to "Temple of the Monkey God", and it can't pop Lead bloons without the Plasma upgrade or the Robo Monkey upgrade.
* FloatingContinent: The Floating Islands and Ascension tracks in ''[=BTD5=] Deluxe'' 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."
** From the fifth game's fandom comes NAPSFRILLS, which means '''N'''o '''A'''gents, '''P'''remiums, '''S'''pecialties, '''F'''arming, '''R'''oad '''I'''tems, or '''S'''elling.
** The first three refer to the out-of-gameplay boosters like special agents, [[AllegedlyFreeGame premium upgrades]], and specialty buildings.
*** "No Farming" means no method of cash gain other than bloon pops. YMMV, but the 3|x village (Monkey Town) is debatable in this respect.
*** [[NoDamageRun No Lives Lost]] can be a challenge on its own, but prohibiting spikes and pineapples ups the ante. Not selling towers goes further still by denies money and space refunds, meaning that careful placement and upgrading is required.
** Any variant of NAPSFRILLS, including [[BreadEggsBreadedEggs NAPS, NLL, and NAPS NLL]], can be used not only for normal maps, but special missions, [[PlayEveryDay daily challenges]], and random missions as well.
* 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''.
* FragileSpeedster: Pink and Yellow bloons. They are the only bloons in the entire series that are faster then the Ceramic Bloon, but they only have 4 and 5 layers respectively.
* GameMod: Several Website/{{YouTube}}rs have created and even distributed (now discontinued) mods for the Steam ports of ''[=BTD5=]'' and ''Battles''. Here are some examples:
** For [=BTD5=] Steam, there's ''[[https://www.youtube.com/playlist?list=PLX0_8WfvJXc1LZmhPMUjOHY694WRd9q8j Revenge of the Bloons]]'', which has changes such as glue gunners hitting M.O.A.Bs, but the most notable change is that there are fewer rounds to complete on all difficulties, but the game is a LOT harder. In fact, it makes [[HarderThanHard Impoppable]] [[NintendoHard Mastery]] impossible to complete [[FunWithAcronyms NAPS]], and still quite '''brutal''' with anything short of Double Cash!
*** [[https://www.youtube.com/channel/UCrX4aggDffFpzXekReyI8tQ Junior Monkey]] also modded the Flash-based version of [=BTD5=] to add [[https://www.youtube.com/watch?v=zrvI26aMvsI Mastery Mode]] from the mobile and Steam releases, [[https://www.youtube.com/watch?v=beX70KefSK8 camo-removing Viral Frost]], [[https://www.youtube.com/watch?v=e_1HekYyZqo glue that affects M.O.A.B.s]], and [[https://www.youtube.com/watch?v=mk7iPQ_SroY ice wizards]] that freeze normal bloons while popping them (like directional Snap Freeze) and can conjure Absolute Zero, only it can stall M.O.A.B-class bloons as well!
** ''Battles'' has ''Bloonz Reborn'' by [[https://www.youtube.com/channel/UCZRm5tzMNwGX-kxZeuwRtKQ BTD Blaze It]], which balances out all towers and upgrades so that anything is viable and the presence of a meta is minimized. [[https://www.youtube.com/watch?v=BXK0cIzm3Tc Here]] [[https://www.youtube.com/watch?v=ro4OyaR6pJA are]] [[https://www.youtube.com/watch?v=kPO3Sfs7vKA some]] [[https://www.youtube.com/watch?v=khSqs7MJbJc RanDumb]] [[https://www.youtube.com/watch?v=HFPozdfEa9o gameplay videos]], and [[https://www.youtube.com/watch?v=8lbJs1yT5ag two]] [[https://www.youtube.com/watch?v=lu-PSQKQ1O8 by]] [[https://www.youtube.com/channel/UCWi3we65vJWzOQ-uJWT6fYQ/featured Black Profile Picture]].
** Also for ''Battles'', Randumb returns with ''4/4 Towers'', which adds 3rd- and 4th-tier upgrade combinations to all towers except the monkey sub, engineer, bloonchipper, heli pilot, and supermonkey. [[https://www.youtube.com/watch?v=z_zVpoPD8Y4 Here]] [[https://www.youtube.com/watch?v=Av4ycFXzJyE are]] [[https://www.youtube.com/watch?v=crKs09IU0q8&t=1s a]] [[https://www.youtube.com/watch?v=kao_2r2DhfE&t=39s few]] [[https://www.youtube.com/watch?v=EFMUVO8vliQ tower]] [[https://www.youtube.com/watch?v=ys7ibASEhfE examples]]. That isn't all the mod has!
* GameplayAutomation: Nonstop mode in the mobile/Steam releases causes the rounds to advance automatically. This can be disabled in the pause menu.
* GamePlaysItself: In A-{{p|un}}op-alypse mode, the rounds advance automatically with no option to stop this ingame, even if there are bloons from the previous wave still on the map. Ditto with ''Battles''.
** In the former case, the mobile/Steam version not only allows you to pause in any singleplayer gamemode, but you can save your game an come back in between rounds, somewhat defeating a major part of Apopalypse.
* GoldenSuperMode: The left path of the Super Monkey.
* TheGoomba: Red Bloons.
* GuiltBasedGaming:
** Message when you try to quit a level: "If you quit, [[TheBadGuyWins the bloons win]]!"
** One of the messages shown between rounds in the second game tells the player they may not need to use every single type of tower to complete the game, but to think of all the programming and artwork that would be wasted if they didn't.
* 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-{{p|un}}op-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 {{Lightning Bruiser}}s.]]
* 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.
* HelicopterBlender: The Heli Pilot's 3|x upgrade functions as 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 two streams of the regular purple plasma rolled into one. It fires two of them, effectively dealing as much DPS as [[ThereIsNoKillLikeOverkill 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'', and stronger still then the ''Ray of Doom''.
* HydraProblem: If a Regen Pink or stronger is not the original color, and if it regenerates, the new color will still contain as much bloons as it did before.
* 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 without a First Strike Capability, 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.
* HoistByHisOwnPetard: Zebra regrow bloons pop into two bloons that will each regrow into another zebra, which can then each be popped and allowed to regrow into four zebras, and so on. A monkey with an ability that sends bloons back can allow them to multiply indefinitely, until the point where [[OhCrap the bloons become dense enough that the ability can't affect them all, releasing a rush of high-level bloons past your defenses.]]
* KillSat: The Bloonsday Device.
* LevelInReverse: In [=BTD5=], they added a reverse mode to make bloons go from the exit(s) to the entrance(s).
* LinearWarriorsQuadraticWizards:
** 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.
** 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 than the Ceramic bloon, holds 4 Ceramics itself, and moves faster than the stronger blimps.
** All MOAB-class bloons become 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!
** For the monkeys, we've got the Super Monkey: it fires quickly, has good range and kicks a whole lot of ass. It becomes that much more powerful and [[RuleofCool awesome]] when upgraded...
** Also, for the monkeys, there is the Heli Pilot on Pursuit Mode, which actively chases down bloons.
** 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. {{I|nfinite}}NFINITE!
** 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.
** Monkey subs are initially little more than expensive dart monkeys that can only be placed in water - however, the fourth upgrade on the right path gives it the ability to ''destroy a ZOMG!''
* 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.
* NintendoHard: The Hard track in 2, the ''Ant Hill'' track in 4, and ''Tar Pits'' and ''Down the Drain'' in 5. Some of the daily challenges including ''[[VideoGame/{{VVVVVV}} VVVVVV]]'' (August 23, 2014) and ''Anti-Camo Dust'' (May 17, 2015) are this.
** If you see the challenge made by the notable users incogneato, sniper 355, The Supermonkey (formerly [=JamesNg2=]), lla26, Gamzdude, or [=Superbloons321=] (formerly Simone Esposito), you better run for your life. Or consult the first of the list for a guide through Ninja Kiwi's forums.
** [[HarderThanHard Impoppable difficulty]] in the mobile and Steam releases can be this on harder maps.
** Mastery mode. Bloons are one rank higher (red=blue, blue=green, etc.), yet you only get non-mastery cash from popping them. This may not fit the trope on the lower difficulties, but on Impoppable (and even Hard on some maps), Masteries can easily be this.
* NonIndicativeDifficulty: Discussed in [=BTD3=]'s pre-round comment.
-->"Some tracks are hard on easy, and others are easy on hard. Ain't life funny."
** For an actual example, Tunnels is infamously easy despite its "Expert" rating, because MOAB-class bloons fly over the tunnels instead of through them, so they are not protected by the tunnels unlike regular bloons, and the bloons you can see always travel in perfectly straight lines, perfect to be popped by Dart Monkeys, Ninja Monkeys, Super Monkeys, Glue Gunners, or especially Dartlings.
** On the other end of the spectrum, Crypt Keeper and Downstream are rated "Advanced", yet their designs reek of an Expert map. Alongside, there is River Rapids, considered to be Advanced by a few.
* NoPlotNoProblem: As the entire series was based off a simple flash game where a monkey pops balloons, no real plot has ever been added. The second highest comment on [=BTD5=] on Kongregate states "I'm still wondering why balloons are such a threat to monkeys."
* 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.
* NumericalHard: The difficulty levels just increase the speed of the bloons, the price of the towers, and the number of lives you have. In imppoppable difficulty, the M.O.A.B-Class Bloons are stronger and there are 5 instead of 1 Z.O.M.G(s).
* 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, unless it is increased by premiums or Support Chinook.
** 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.
** The submarine gets this ability with the first strike capability upgrade: a single missile, on an extremely long recharge time, which can completely destroy a ''Z.O.M.G.''
* OneHitPolykill: Several towers have abilities that pierce, allowing the popping more than one bloon per shot. This is a ''very useful'' ability against a ZergRush (which will be the norm for later waves).
* PainfullySlowProjectile:
** M.O.A.B. Class Bloons are [[MightyGlacier extremely slow]]. And a good thing too, because they are ''[[OneHitKill very painful]]''.
** the darts fired by Monkey Aces.
* PlayEveryDay: The Daily Challenges in 5. They can range from slightly trivial to nightmarish (see [[NintendoHard Nintendo Hard]] above).
* 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=], though it later got removed.
* 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.
** HydraProblem: If a Regen Pink or stronger is not the original color, and if it regenerates, the new color will still contain as much bloons as it did before.
* 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.
* SelfImposedChallenge:
** Trying to do a game [=NLL=][[note]]No Lives Lost[[/note]].
** Alternatively, doing a game [=NAPS=][[note]]No (Special) Agents, Premium [=(Upgrade)s,=] Specialty (Buildings)[[/note]]
*** Taken a small step forward with [=NAPS=] [=NLL=].
*** Take a [[UpToEleven marginally bigger step forward]] with [=NAPSFRILLS=][[note]]No Agents, Premiums, Specialties, Farming, Road Items, Lives Lost, Selling[[/note]]!
* SerialEscalation:
** 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 an [[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 Boomerang Throwers can be upgraded to throw "[[Film/{{Krull}} glaives]]".
*** A vast majority of Daily Challenges in the fifth game are this.
* 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 and 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 older versions of [=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.
* ThereIsNoKillLikeOverkill: "Overkill" doesn't seem to be a word in the monkey vocabulary...at all...
* TurtlePower: The Tribal Turtle.
* UnwinnableByDesign / [[UnwinnableByMistake Mistake]]: Certain Daily Challenges from 5 like ''Anti-Camo Dust'', ''Highly Opinionated'', and ''Ten Hits'' were impossible for many players and so they had to be fixed later, either after 12 hours since the challenge released or even three months after it initially expired. A list of impossible DCs can be found [[http://bloons.wikia.com/wiki/Daily_Challenge#History-based here]].
* UpdatedRerelease: ''Bloons [=TD5=]'' on Steam, which replaces ''Deluxe''. Even though it seems like a direct port of the tablet versions, there are some changes such as no [=IAPs=].
* VideogameFlamethrowersSuck: Subverted with the "Dragon's Breath" upgrade for the Monkey Apprentice, which does massive amounts of damage per second and 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.
* WeakButSkilled: BTD Battle's Cobra tower has a slow attack speed, can't detect camo normally, and short range... (although it pops two layers per shot similarally to an vanilla Sniper Monkey and can increase firing speed with a tier 1 upgrade.)... but can give you free money similar to a farm, make your opponent's bloons stronger, reduce the cool-down for tower boosts and bloon upgrades, steal your opponent's lives, (which used to be able to kill them before being nerfed), and allow you to send powerful bloons earlier then your opponent, and send [[BossInMookClothing M.O.A.B.s and B.F.B.s]] from your side to your opponent. Also, [[ArsonMurderAndJaywalking it doesn't cost very much]], so they can quickly turn into GodDamnedBats if used correctly.
* 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: three Big Ones, one Master of Air, one Bloon Liquifier, one Arctic Wind and 1 High Energy Beacon or MIB Call to Arms, and 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'', since the 4th tier SML gives the temple an ability that doubles the firing speed for all of its powers and 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) and 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 and 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 and B.F.B.s. 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 '''and''' hydra rockets directly at the bloons and the Operation Ground Zero, which grants the ability that can be used to clear the screen of bloons.
** The Spiked Mines Factor: It fires at an ''extreme'' rate and its spiked balls explode when they reach their pop cap of 16 bloons. Since its downgrade is the Spiked Ball Factory, its spikes also deal 3 times as much damage to ceramics and MOAB-classers as regular spikes.
** The Apache Dartship fires darts at the bloons like a machine gun and 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 darts and 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.
* 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. B.F.B.s get murdered if the temple is accomplimied with a 2/x village.
* YouWillNotEvadeMe: The Ice Tower's Arctic Wind slows down the bloons, allowing the Snap Freeze effect to torture them to the last layer (or until it reaches a point the Ice Tower cannot pop it such as Zeras or Whites)
* 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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