Known Bugs

This page is for a list of bugs that were discovered. They are separated into Confirmed and Patched.

Fake Block Glitch

 * A glitch occasionally allows to pop Bonus Dart Bloons, Triple Dart Bloon or Boomerang Bloons (I tested on ID 1639252) by making the dart pass through a Metal Block (when the bloon is surrounded by blocks in any side).

Stubborn Monkey Glitch

 * When right-clicking and clicking the "Rewind" button, the game will reset, however the monkey and the Screen_Shot_2013-06-28_at_2.38.35_PM.pngs will still be there and you can't pop them, nor use the monkey, but you can only pop bloons and use the monkey of the current level when you are playing a level. Refreshing the page can solve this problem. (link to video)

Determined Pac-Man Glitch

 * This happens on all Bloons Games excluding Bloons Junior. When a Pac-Man Bloon is popped and the player clicks main menu before it runs out, the Pac-Man will still be there and it can still go anywhere around the main menu before the time runs out. (link to video)

Exploding Ice Bug

 * This happens occasionally in some Bloons World levels.( I tried it on the level with the ID 1343339)When there are more than 130  Bomb Bloons, only some of them will pop, then they suddenly freeze and then explode. There is no exit from this glitch other than closing your browser.  (link to video)

Frozen Pacman Glitch

 * If a Pac-Man Bloon gets frozen, it doesn't look frozen, but it can't be popped.

Bloons Pop 3:
Hint Glitch
 * After earning 200 points, you have unlimited hints, even if you have  no points . Even though Bloons Pop 3 is a few years old, Ninja Kiwi hasn't yet patched the glitch.

BTD1:
Iced Bug 1
 * Sometimes when the Ice Tower attacks, some bloons will stop but not appear to be frozen.

Hypersonic Speed Tack Shooter Bug

 * If you press tab until the Faster Shooting box is surrounded in a yellow box while it can be afforded, press the space bar until the speed is hypersonic and the upgrade is bought. Then, most bloons can't get by the tower. You will lose money since you couldn't originally afford it. This glitch can be done by another towers (such as Dart Monkey with infinite piercing darts, Ice Tower with unlimited freeze time), however those do not work.

Buy for Afford glitch

 * Sometimes, after you accomplish the Hypersonic Speed Tack Shooter bug, part of the "Buy for" screen appears in the "Can't afford" screen for the upgrades. This usually happens with the Tack Shooter you do the glitch on, but it can happen with any tower, as shown by the slideshow below.

BTD2:
(Every BTD1 Glitch works in BTD2)

Laser Vision Trick Bug

 * In BTD2, the Laser Vision upgrade pops frozen bloons, but it makes the sound a dart does when it hits a frozen bloon.

BTD3:
Lacking of Money Bug (Very minor)
 * In BTD3, you can place a Monkey Beacon when you don't have enough money. You can choose where to place it, however, it says "not enough money." and it won't be placed. It doesn't happen with the other towers.

Monkey Beacon bug

 * This works only in BTD3. You must have a Monkey Beacon with the Monkey Storm Beacon upgrade, it will allow you to activate Super Monkey Storm. Then, sell the Monkey Storm Beacon, the Super Monkey Storm will still be there and you can use it unlimited times without having the Monkey Storm Beacon, despite the description of the upgrade says that it allows it to call Super Monkey Storms.

Super Pineapple Explosion bug

 * In BTD3, sometimes the Pineapple will pop 2, or even 3 layers of bloons.

Melee Bug 1

 * The boomerangs/glaives that the boomerang/glaive thrower is holding count as projectiles, meaning any bloon that runs into them will be popped. Strangely, the held boomerangs/glaives do not appear to have a pop limit. Also, you can't see it, so it could be the one on it's head.

Start Round Glitch

 * On the first track in BTD3, sometimes there will not be a start round button after a round. You have to use super monkey storm to get the button back. More common on easy.

BTD
Orientation bug
 * In HD versions of Bloons TD, when the player adjusts the volume, the orientation appears to be sideways even though the orientation is completely normal.

BTD4 only
BTD4 Challenge Restrictions bug
 * Screen Shot 2013-06-28 at 11.49.00 AM.png the Sweet Tooth challenge(pass in Easy mode using only Dartling Gunners and Spike Factories) you can use a Dart Monkey by pressing its hotkey (D). It will still attack!

Beacon Bug

 * In BTD4, some towers covered by the Monkey Beacon's range will not get affected by its bonuses.

Corrosive glue is not corrosive bug

 * Sometimes in BTD4, the glue gunners' corrosive glue will not pop bloons on fast forward.

Spike Storm glitch

 * The Spike Factory's final upgrade Spike Storm will sometimes only cover up half the screen in BTD4.

Road Spikes Not On Track

 * On BTD4, if you hover Road Spikes half on the blue space with your rank, XP, the level, and the Pre-RoundScreen_Shot_2013-06-28_at_12.14.51_PM.png Comment, your NK account, or the final side of the track, you can place the Road Spikes there, even though they can only be placed on the track.

Rank 99 bug

 * In BTD4, when you go up to rank 2 it says that you are on rank 99 but on the other rank thing at the bottom it says rank 2. People can get very exited over this, but its not real!

Black Patch Glitch

 * Sometimes, the spikes fired by a spike factory have a black square around them. (This may be just my Screen_Shot_2013-06-30_at_7.50.36_PM.pngnation but this seemed to happen more often when a bloon buster mortar fired at a spot within the spike factory's range.)

BTD4 and BTD4E
Dartling Gun Bug
 * Bug 1:  Sometimes in fast forward the Dartling Gun shoots200px-Glitchy dartling gun.png 2 streams of darts. It is more common when the Increased Barrel Spin upgrade is purchased.
 * Bug 2:  (Does not work with Laser Cannon) When Fast Forward is active, sometimes if the Dartling Gun's shots reach bloons, the darts will not pop the bloons.

Double Missile Bug

 * In BTD4 or BTD4E, if the game is in fast forward, Double missile glitch.pngly a second missile can be seen launched from the Missile Launcher.

Iced Bug 2

 * This bug is very rare, when a bloon is frozen by an Ice Tower, the bloon will stop forever, and it cannot be thawed or affected by the towers or road items, and you need to exit the game. More common in BTD4 and BTD4E.

Skip Round Lag Bug

 * Sometimes, when you start a round in BTD 4, BTD 4 expansion, or BTD 5, the game will freeze, and then the round will be completed. You will get your reward money, but no bloons will have appeared on the screen. This is a lot more rare in BTD 5 but is most seen in older computers in BTD4. It happens most often in the first few rounds.

Melee Bug 2

 * Boomerang glitch.JPG boomerangs that the Boomerang Thrower shoot, they will not return to the tower; instead, they will vanish at about 2/3 of their way. And, even if Fast Forward is off, the boomerangs will not pop any bloons. This does not happen in BTD4 iOS.

Explosion bug

 * In BTD4 and BTD4 Expansion, if there is a large amount of bloons that the Bomb Tower attacks, the game will not show the explosion, but only the frags (from the Frag Bombs premium upgrade). This can also happen with the Mortar Tower. It only shows the Bloon's layer popping.

Road Spikes Jump bug

 * In BTD4 and BTD4 Expansion, there is a glitch where fast bloons can travel a short distance over road spikes before popping, causing the bloons that spawn from them to miss the road spikes completely. Also happens with the road spikes produced from Spike Factories.

Wacko Spike Factory Glitch

 * If placed far enough from the track on any given map,the Spike Factory will randomly place spikes on theScreen_Shot_2013-06-29_at_9.27.26_AM.png border of it's search radius.

BTD4E only
Banana Farm  On  Deflation  Bug 1:
 * It is possible to get a Banana Farm on Deflation by pressing its hotkey (F), however, it gives no money.

Black Area Bug

 * In Bloons TD 4 Expansion, on the Subterranean Sewers track, around round 45, a black patch may appear in the middle of the track. It gets bigger and smaller at the edges, but it gradually gets bigger, covering a 3-4 inch square of the track by Round 50.

Track 6 Bug

 * If you play track one on the beginners track on BTD4 expansion and save, when you go to the original, it will Screen_Shot_2013-06-29_at_9.13.33_AM.png you to the Firecracker track. Also, if you quit BTD4 and re-load it, press "Resume Game." You might recieve a notice saying "Congratulations! You passed this track on null". You can also earn an achievement for this.
 * If you click "Keep playing in freeplay mode", then you just start from whatever round you were at when you quit BTD4. You can even save!
 * Beating the track on the difficulty it was on still gives you the "You beat this track on (whatever difficulty you were playing)" notice, and then it's freeplay.

Specialties bug

 * In BTD4 Expansion, if you use the Vehicles specialties, it reduces the cost of Monkey Buccaneers and Monkey Aces but it increases the cost of their upgrades.

Error by creating new towers bug

 * In BTD4 Expansion, in the towers menu, when you hold the mouse on the Dartling Gun or Spike Factory it Screen Shot 2013-06-28 at 12.54.03 PM.png the image of the Dart Monkey instead of the image of the Dartling Gun/Spike Factory.

Towers Placeable Everywhere 
 * If you mouse over a spot where you can place a tower when you have a tower selected, and right click on that spot, then while the menu is up, click anywhere and you can place the tower anywhere.thumb|300px|right|How to Place towers any place you want . . . even on the track Will not work on some computers and/or websites.

Locked Bloons Bug

 * In BTD4 Expansion, you sometimes cannot play in the Subterranean Sewers track. If you click "Start Round" the round will only send up to 5 bloons (other bloons will be locked at the beginning of the track) and if they go away, you lose lives but you can't play the next round. Then, if you quit the game and play another track, the locked bloons will remain on the track, and you cannot pop them.

Covered Menu bug

 * The tower description is covered by the bottom of the screen. See the photo for more.Screen Shot 2013-06-28 at 12.56.20 PM.png

BTD4 iOS
Monkey Ace Bug 1
 * In the Monkey Temple track, if you put an un-upgraded Monkey Ace before starting round 66, in the current level and round 69 Monkey Ace will shoot 6 darts instead of 8. This is more likely to occur if you're playing on Hard difficulty.

Non-Arctic Arctic Wind bug

 * In BTD4 iOS, Ceramic Bloons popped from a M.O.A.B. Do not get slowed by arctic wind if they are popped in it's Range. The Bloons can still get frozen, however.

Playing after you lose bug

 * In BTD 4 iOS, there is a glitch where if you lose, and you exit and re enter the game, the pause screen will appear, and if you press the resume button, the game will play for one frame. Towers will shoot, Bloons will pop, and you can even get rounds to end, and even start the next round if you hit the button during the one frame that the game is playing. Sadly, entering and exiting the game multiple times to keep playing is a very slow process, and it is easy to get bored by doing it.

Deflation Money bug
When the Monkey Engineer was added, there was a bug in which you could collect money via the Bloon Trap in Deflation mode. This was later patched.

BTD5
Co-Op Money Glitch
 * If you give money to your ally, that won't show. (e.g. if your ally has 350 cash, and you give him 350, he'll have 350 unless you close the "other player's cash" tab and open it again.

Monkey Ace Bug 2

 * 3/0 Aces can target camo bloons but not pop them. 4/1 aces can drop pineapples at the camo bloons, but the pineapples can't pop them.

Glitchy Chest Bug


 * ​ Sometimes, you can't click on the Monkey Money chest.



Mortar Tower SFX Bug

 * After buying Bigger Blast, the mortar explosions will not be heard.

Short-Lived Bug

 * Sometimes, the game messes up how many rounds are left for your tower in the mission. Most commonly, it skips a round, so you only have 9 rounds instead of 10.

Unlimited NK Coins/MM Glitch

 * When you purchase MM with NK coins, you won't lose MM when you buy Special Agents, nor NK coins. See: http://www.youtube.com/watch?feature=endscreen&v=fh8DDevWhTY&NR=1

Wacko Spike Factory Bug

 * This glitch also happens in BTD5. (See the "BTD4 and BDT4E" section for more details.)

Main Menu Bug

 * When you want to leave a game, sometimes when you leave the border of your previous game (Towers, Special Agents, Lives, Money, etc.) will be around the Main Menu. (see picture)
 * Main menu glitch.png

Main Menu Glitch 2

 * This is sort of the opposite of the main menu glitch, if you tap the house, the game will still show, but not the border.

Lag Bug
 * Bug 1:  In BTD5, if you click the "Sell For" button very fast, you can click the button 2 times and you get the double of the money. Happens frequently in laggy computers.
 * Bug 2: O n laggy computers, you have only one tower with an ability, but if you click the button many times during a lag spike, the ability can be used more than 1 time (for example, you have only one  Spike Storm  ability but you can use it 5 times). This makes some abilities way deadlier.

No Playing

 * This happens when your computer gets really laggy, or if you have a slow computer. Sometimes in BTD5 when you go in a game mode, you don't go to the track, but just go back to the game modes and tracks and if you play Easy, Medium, or Hard you will be taken back to the main menu! The only way to stop this glitch is to refresh your page.

Earlier is Later bug

 * In the February 21 2013 challenge (I Spy with My Eye), the description says the challenge ends at round 70, but when you start the challenge, it says 85. It is changed when you reach round 2. It will also happen with other challenges.

Game Over after new game bug if it's laggy

 * Sometimes, when you lose a game, after you start a new game, the game will show the pop-up that says you lose the previous game (and the round where you lose).

Towers Over the Track bug

 * In the track Clock, you can place towers and agents in the circumference, even if the bloons will go in that. However, road items can only be placed around the borders of the clock.

Out of the Range bug
 * Sometimes, the Super Monkey will attack out of the range, even when there are no MOAB-Class Bloons.

Undo Tower Placement bug

 * Sometimes in the Co-op Mode the game does not allow you to place towers, sending the message "Tower placement declined. Your ally placed a tower there before you", and you need several tries before placing them. This usually occurs when you are on low quality and your ally is not, making the game detecting the tower on an illegal position (for example, in the opposite side), or when you place more towers very close to each other.

RBE bug

 * Sometimes, in Apopalypse Mode, the RBE of the round does not change: it remains 24 (50 in BTD4), independently from the round you are playing.

Auto-Upgrade bug

 * When playing in Co-op Mode, sometimes the towers will be upgraded automatically and it is possible to get impossible combination of upgrades, like 3-4 Dart Monkey.

Ending Round with Bloons bug

 * When playing in Co-op Mode, sometimes the round will end when there are weak bloons remaining on the track. They can still be popped, however, if they go away, you won't lose lives. But then, after 2-3 rounds your lives countdown decrease briefly for the bloons that leaked with this bug.

Harmless Towers

 * If you get 6 MIB Call to Arms and a 2/4 Boomerang Thrower,and the boomerang thrower is within the range of the MIB Call to Armses, activate all 6 MIB Call to Arms, and then a second later activate Turbo Charge. For a few seconds the Boomrang Thrower will shake around, then when the MIB Call to Arms end, the Turbo Charge will act ike a normal Turbo Charge. (On fast forward, this doesn't happen.)

Delicious Banana Glitch

 * In BTD5: if you click play while the title screen monkey is eating his banana, the eating sound will continuosly play with no end, even when you go onto a track. You can fix this by refreshing the page or closing the browser then going back on the game.

Hypersonic Spike-O-Pult Glitch

 * To accomplish this glitch, the player needs a 2,0 Dart Monkey and a 0,4 Dart Monkey. Then you activate the Super Monkey Fan Club ability and upgrade the 2:0 Dart Monkey into a Spike-o-Pult, but it is only Screen Shot 2013-06-28 at 2.02.53 PM.pngsonic for 10 seconds. This also works on Juggernaut as well, allowing the player to easily obliterate ceramics and MOAB-class Bloons.

Playing In Main Menu bug

 * When you are severely lagging and press the home button many times in quick succession, and press go to main menu, then play another track, there will be another box saying "Are you sure you want to quit?"

Ability Locking Bug

 * In BTD5, if you load a game that has towers with abilities, the abilities become unusable until they recharge again.

Badge Glitch

 * Badgeglitch.jpgimes, when the player taps on a badge and wait, it will become invisible, but some letters of it will remain.

Popping-less Bug

 * Glue Gunner's pops are inaccurately measured when multiple bloons pop at the same time (from splitter bloons or splash upgrade). For example, a White Bloon is glued. White layer counts as one pop, and the resulting bloons pop simultaneously, so the two bloon pops count as one.

Monkey Village Harming Bug

 * Placing a Monkey Village near a Bloonberry Bush will surprisingly reset the amount of spikes.

Radar Scanner Trick Bug

 * When a Monkey Village is upgraded to Radar Scanner, it won't grant Camo detection to other High Energy Beacon Monkey Villages.

I Don't like Red Hot Rangs bug

 * If you have a glaive thrower and upgrade it to red hot rangs, the glaive in the monkey's hand looks like a normal glaive until the monkey throws it, then it comes back to him a red hot rang.

Hotkey bug

 * When using the Dart Training Facility (Level 3) building, if you use the hotkey Q for placing a free Dart Monkey when available, but you don't have enough money for placing a normal Dart Monkey, the hotkey Q does not work, and you have to use the button in the tower menu to place the free Dart Monkey. Same with Spikes R Us level 3 building with the Road Spikes.

Meerkats don't like Corrosive Glue Bug

 * Normally, a 2/2 Glue Gunner looks like a 2/0 Gunner. However, when placed within the range of a Meerkat Spy, they look like an 0/2 gunner.

BTD5 Deluxe
BTD5 Glitches On Deluxe
 * Can someone with Deluxe make a list of what normal BTD5 glitches work on Deluxe?

Medium Is Hard

 * In Bloons TD 5 deluxe, you can get Extreme Reverser by beating Main Street on reversed medium, even though the description says you have to beat an extreme track on reversed HARD. It is unknown why this happens.

Sentry Bug

 * Sometimes, in No Escape, the Monkey Engineer's sentries point one way but fire nails somewhere else.

Bloonchipper Bug

 * Sometimes, the Bloonchipper pops all layers of bloons.

BTD5 iOS
Monkey Money bug
 * In BTD5 on iPhone/iPod Touch, you can get infinite monkey money by changing the day of your iPhone/iPod Touch ahead by 1 and opening the money chest. This also happens in PC versions. Though, repeating this may not be recommended.

Treasure Chest bug

 * In the iOS versions of BTD5, the Treasure Chest will give you Monkey Money, but it is not multiplied. However, this may be intentional (if you do the math).
 * The days in a row counter will never go up also.

Volume Bug

 * In the version 1.2 of Bloons Tower Defense 5 iOS, the music gets noticeably quieter after the player resets the track.

Road Spikes Bug

 * When spamming road spikes in BTD5 iOS, and the player ends up with less than $30, the player can buy his last pile of Road Spikes for less than $30.

Hole by Selling bug

 * In iOS versions of BTD5, in the Protect Monkey Town special mission, it is possible to sell the Monkey Town for $0, leaving an hole in the middle. You still lose lives if bloons will go in the hole. Same for the Wizard Lord, and if this happen, you automatically lose when a tower needs to be sacrificed.

Super Monkey Spike-O-Pult

 * (Only works in BTD5 iOS) If the player activates the Super Monkey Fan Club ability, it will affect Juggernauts and Spike-O-Pults as well, but they will only shoot Darts. Oddly, they also shoot Spiked Balls/Juggernaut Balls at ordinary fire rate.

BTD Battles
Energy Bug
 * Most of the time when you get energy in Bloons TD Battles there is "Negative Time," where time goes negatively and you never get energy until you reload the page.

No Lives Lost bug

 * In BTD Battles, sometimes the player (or the opponent) won't lose lives when a bloon leaks. The only way to stop this bug is by leaking a Ceramic Bloon or a MOAB-Class Bloon. This is the most common bug in BTD Battles. EDIT: This is just lag.

Harmless Towers

 * Some Towers will not shoot it's weapons sometimes. Happens commonly with Glue Hose, Turbo Charge and very oftenly with Glaive Thrower/Riccochet/Lord in BTD Battles. It is unknown why this happens.

Bloons Super Monkey:
Invisible Sun God bug
 * A glitch occasionally occurs with the Sun God: its head will become totally invisible/trasparent.

Bloons Super Monkey 2:
Upgrades Lost glitch
 * When you close BSM2 then log back in again,sometimes you lose all the upgrades you have purchased. If you are using the third or more of a particular path, you have to rebuy upgrades up to that point.

Mirrored Boss glitch

 * Sometimes in the last level (3-5) in Deep Bloon Sea in Bloons Super Monkey 2 the boss will glitch and it will display a mirrored boss in the upper corner while the real boss will come down all the way to the end making you lose the level.
 * Sometimes, the Ruin bugs out and also gets cloned. Proof

Ninja Kiwi is not Ninja Kiwi bug

 * Occasionally, BSM2 will give you the message "play on Ninja Kiwi" when you play it on Ninja Kiwi. This only happens when you click on the word "connecting..." at the start of the game.

Third Boss Glitch 2 (aka No Boss Glitch)

 * When bronze is obtained near the end of 3-5, the boss will not appear and you win.

Upgrades Not Bought Before bug

 * When starting the game at Stage 1-1, Ninjakiwimine2 experienced a glitch that he has Fire Wave upgrade for Left Arm (Magic Upg. 3), even though he haven't bought it before. This glitch is also possible when Intense Magic and Fireball upgrades aren't bought.

Angry Squirrel Glitch

 * Even when bloons haven't leaked, angry squirrel will be berserk permanently.

Challenge Saving Bug (Minor)

 * It IS possible to save in Challenges, however, it's only before you start the first round which is rather useless...

More than max glitch

 * In the July 18th 2012 challenge, if you have the max of one tower, and sell a different one, you can buy another of that one, but once you buy it, it will be locked again.

Bad Aim Bug

 * Sometimes towers will attack in a direction completely away from the bloons and still pop them in BTD5. Happens frequently with fast-rate towers, such as Plasma Blasts.

Missing Menu Bug

 * On the intro in BTD5 right click, then click on the play button. The play button screen will still be there yet if you click when any of the menus would be (eg: special agents), that menu will be opened.

Life Bug

 * Mar 11 DailyChallenge Glitch 2012.png bug can happen on almost everything you do on BTD5. The first cases of it happened on the March 11 2012 Daily Challenge, and the Wizard Lord Special Mission. The glitch is: When you lose all of your lives, the Game Over screen will not appear and you can still play. However, your towers cannot attack and there will be no "Start Button".

10 Bug

 * This rarely occurs, once you load a save game with a Portable Lake with Monkey Buccaneers on top of it, it will show the number ten with a hour glass next to it.

Alarm Bug
If you press the quit button, run out of lives, then press yes, an alarm will sound until you play, where you get a Game Over. This also happens in the Wizard Lord special mission when you run out of towers, except there is no escape from it other than closing your browser!

Track 2 Bug

 * If you play the beginners track on BTD4 and save, when you go to the expansion, it will take you to track 2 although ninja kiwi seems to know this as when you do this there is a message saying that the save is from the original game and results may be unexpected.

Bug in log in game
The game has a system where you can only play right into the site from which it was created Bloons Tower Defense 5, but an update, double money, the game itself did not identify the site of origin, even if you are on Ninja Kiwi, giving the message "play now on Ninja Kiwi".

Castle Bug

 * In BTD5, there's a rare bug where when you complete Castle Hard, you don't get your monkey money.

Special Abilities Bug

 * When a tower with an ability is sacrificed to a temple, the ability will stay,200px-Abilities glitch.png though it is supposed to disappear. The ability can't be used.

Bug 1
In the MOAB Madness special mission, after winning the challenge, a comment will appear (Easy peasy.), which is the default comment for Round 2 and that's ironic, because there is no Round 2 in the MOAB Madness special mission. However, an update made no comment appearing (even if tips are turned on) in Daily Challenges, nor Special Missions.

Bug 2
When opening a Daily Challenge (or Special Mission), when starting the challenge or mission appears the default comment for round 1 (the welcome message) instead of the description of the challenge or mission. This was fixed on April 2, 2013.

Hotkey Abuse Bug
This is a glitch which is similar to the tower placement glitch except you can use the hotkey of a not yet unlocked tower.

Choose Game menu Bug

 * During gameplay, if the player wants to buy Special Agents, the Choose Game menu will also come up.

Money Losing bug
In BTD5, when you press the hotkey (, for the left path and . for the right path) for upgrading on a path where there is an upgrade locked, you will lose money (the cost of the upgrade) for nothing and the tower will not be upgraded. It will also increase the selling price. Fixed in Feb 20, 2013

No MOAB-Class bloons bug
In BTD5, in rounds where there are MOAB-Class Bloons, sometimes they will not appear and you cannot complete the round. This was fixed.

Saving bug
This bug seems to be a sort of Deflation Saving bug. When you try to open a Daily Challenge or a Special Mission, the game will take you to the lastly saved game instead of the challenge or mission. This was fixed on April 2, 2013.

Random Lock Bug
After the Double Monkey Money update in December 19, 2012, before starting BTD5 a giant lock flashing purple and green will appear and in a second you start the game quicker than usual. This bug was fixed in January 8, 2013, right when the Double Monkey Money ended. This may be a holiday surprise for the players.

Upgrade Bug
The upgrade bug only works on BTD4. The bug can only be achieved with very fast reflexes. First, place two towers of the same type near each other. Upgrade one to the maximum (it can be level 3 if you haven't unlocked level 4 variant). Once upgraded to the max level, quickly click on the other tower. The tower will then have the third or last upgrade of the tower, allowing you to save a large amount of money, although it will only gain the trait(s) of the bought upgrade.

0 after buying Special Agents

 * When you buy more than 1 special agent a time, you lose all your monkey money and you will not get the agent. You gain back the Monkey Money only when earning them by completing a game.

Tower Bug
This is a glitch in BTD4 when you save a game in any map and then load it in BTD4 Expansion.

Hydra Rocket Pods Bug
The 2/3 Dartling Gun shots don't explode, but just pierce through bloons.

Opening Title SFX Bug (fixed)
There was a bug in which the sound effects in the opening title wouldn't play. This was fixed on Thursday, June 14, 2012. In the selfsame update, Specialty Buildings were added!

Premium Bug
This is a glitch where if you left click at the top left corner of the premium upgrade, you will activate the upgrade. This glitch was patched 2 weeks after the release of the game.

Pro Tribal Turtle Bug (fixed)
Tribal Turtle Pros cannot be placed on water.

M.O.A.B. and B.F.B. Mortar Tower Glitch (fixed)
In version 3.2 for Bloons TD 4 iPod/iPhone the Mortar Tower could kill B.F.B.s and M.O.A.B.s in one shot, making it very easy to beat all 250 Rounds. It strangely did not effect the damage on any other bloon. Fixed in version 3.2.1.

Monkey Glue Bug
In BTD 4, you can place Monkey Glue off the track. It is often around the borders.

Save Bug
(Only works in BTD5) Complete a difficulty and then click on the save button really rapidly before the plank says "Congrats! You beat this track on _____!". Then when it has saved you must exit out then load it again. Once you passed this level you can save in Freeplay Mode.

Tower Sell Bug
When you sell a tower it doesn't go away and it just gives you money. This occurs when a player opens BTD4's save file when playing BTD4 Expansion (whether or not this is for the first time isn't confirmed).

Track Jump Glitch (fixed)
In BTD5, Bloontonium Lab, Snake River, and Mount Magma suffer a glitch which causes bloons to skip parts of the track. Click here to find out more.

Challenge Bug
After playing a 1-level challenge in BTD4 (such as the one to defeat 50 M.O.A.B.s in one round), placed some towers but didn't yet start the game before quitting, then when you go on it again and click "Load Game", you will get a lot of money and the towers you placed.

Treasure Chest Glitch
When you already opened the Treasure Chest in BTD5, it will be partly open and have a small 999 in it. When you click, it will still give Monkey Money and be fully opened. However, then you can't get Monkey Money the next day. This is not totally a glitch, as this does occur at the time it is meant to happen.

Black Screen Bug
In BTD Battles, if the player loses, his screen will turn black after won a new battle.

News Table Bug
Sometimes, when you enter BTD5, the News Table is bugged, and you can't view any new, or the BTD5 for iPhone table. It is unknown why that happens.

Automatical Chest bug
Sometimes the Treasure Chest gets opened without clicking, the Monkey Money will not get deducted and the days in a row streak will still count.

Banana Farm On Deflation Bug

 * It is possible to get a Banana Farm by clicking in the very edge of the button of the tower. It also gives you money. However, this was patched and it is no longer possible.
 * Something similar could be done with the Monkey Engineer via the Bloon Trap upgrade on Bloons TD 5 iOS. However, this was also patched.

Temple of the Monkey God Bug (fixed)

 * When the Temple of the Monkey God stops firing, it's eyes will be blinking as if it is still firing (fixed on the Jungle track update).