Absolute Zero is the final upgrade of path 2 for the Ice Tower in both BTD5 and BTD6. When used, it will freeze the entire screen of bloons for 4 seconds (including White Bloons and Zebra Bloons). In the mobile versions of Bloons, it also slows M.O.A.B. Class Bloons down to half speed (this can stack with Sabotage Supply Lines). Absolute Zero can affect White Bloons, Zebra Bloons, and Camo Bloons without the specialty building or X/3 Monkey Village. It takes approximately 15 seconds to recharge this ability on Fast Forward with no support.

In BTD6, this upgrade makes a return, but it is now a Tier-5 upgrade with a much more powerful ability. In addition, Ice Shards is no longer possible to purchase in combination with this upgrade, along with the fact that Arctic Wind is instead the upgrade that leads towards this upgrade. The Absolute Zero upgrade also has a less powerful upgrade counterpart Snowstorm. Its primary difference is that this upgrade can now slow down bloons more with its Arctic Wind, slowing down to 40% speed, increasing range and pierce (from 100 to 300) to affect more bloons and freeze more bloons with base attack as well. The ability freezes all bloon types including M.O.A.B-Class Bloons and frozen-immune bloons (Whites, Leads, Zebras) for a significantly longer time, and all Ice Monkey towers attack 50% faster for the duration of the ability. The freeze duration is now 10 seconds, an increase from 4 seconds for bloons and 1 second for blimps. It costs $22,100 on Easy, $26,000 on Medium, $28,080 on Hard, and $31,200 on Impoppable.



In BTD5 Mobile, it is noteworthy to know that the ability can also slow down MOAB-class bloons, not just normal bloons. Also, there is quite an outstanding difference in power between the Absolute Zero ability when compared to Sabotage Supply Lines.

  • Absolute Zero slows MOAB-class bloons immediately to half speed; Sabotage Supply Lines only slows down any bloons that come out, including those that enter the map or those that derive from children bloons.
  • Absolute Zero also freezes the non-MOAB-class bloons on screen, so it can be in favor or out of favor to your defenses, depending on whether the defense can handle frozen bloons well or not.


As Absolute Zero is much more powerful in Bloons Tower Defense 6, it can freeze M.O.A.B. Class Bloons for a short time, which is great against D.D.T.s.

  • Even though the 2.0 update buff allowed Snowstorm to freeze MOAB-class for a much shorter time, this upgrade is more useful because it has no initial cooldown and also because the slow effect lasts much longer.
  • The freeze effect is shorter than Bloon Sabotage, but it gives a much better speed reduction than Bloon Sabotage's 50%. This can be extremely helpful against Round 99, if your main damage-dealing towers can affect Frozen.
  • The Ice Monkey speed buff effect works well alongside the other Tier 5 towers. If possible, set-up Super Brittle and Icicle Impale for maximum effect.
  • Do note that M.O.A.B. Class Bloons affected by the ability count as frozen, so plan accordingly.

Differences Between BTD5 Flash and BTD5 MobileEdit

Buff Absolute Zero ability now slows M.O.A.B. Class Bloons to half speed.

Update History (Bloons TD Battles Mobile)Edit


Nerf Absolute Zero price increased. ($2000 → $3500).

Update History (BTD6)Edit


Buff Absolute Zero pops more bloons per freeze. (30 --> 300)


Buff Cost of Absolute Zero decreased. ($32,000 --> $26,000)
Buff Absolute Zero has more range. (20 --> 40; essentially twice the radial range of a normal Ice Monkey)


Buff Permafrost can now apply to MOABs if crosspathed.
Buff Absolute Zero attack and ability freeze +2 additional layers.
Buff Absolute Zero when ability is active all Ice Monkeys gain +50% attack speed .




  • This is the only upgrade for the Ice Tower that does not have an animated element to its appearance on the track.
  • Although some claim that this ability is useless, it can slow MOAB class bloons in the mobile version, making it an exceptionally economical alternative to 4/x Sniper Monkeys or even the x/4 Ninja. Furthermore, Ice Shards have unlimited popping power and can decimate normal grouped bloons. When packed together with normal bloons, Ice Shards can even shred through M.O.A.B. Class Bloons.
  • Absolute Zero is the cheapest of the Special Abilities in Bloons TD 5, by the cost of the final upgrade alone. In Bloons TD Battles Mobile however, Glue Striker is the cheapest.
    • If the cost of all the path 2 upgrades are counted, the Tack Shooter's ability Blade Maelstrom is cheaper with a total cost of $3705 compared to $4450 for the Ice Tower.
  • Absolute Zero, in real life, is the equivalent of 0 K, which means -459.67 °F or -273.15 °C. At this temperature, elementary particles are in a state of complete stasis. Attaining absolute zero is impossible since it would violate the 3rd law of thermodynamics and quantum mechanics. The position-momentum uncertainty principle in quantum mechanics states that the standard deviation in position times the standard deviation in momentum equals the reduced planks constant over 2. A particle at absolute zero would have 0 momentum and a standard deviation of momentum equal to 0. A standard deviation of position multiplied by 0 (the standard deviation of the momentum of a particle at absolute zero) equals zero and not Planck's reduced constant over 2, thereby violating the position-momentum uncertainty principle. Therefore, absolute zero is impossible to attain. Yet another reason quantum mechanics challenges every law of science. (Such as, on an atomic level, an atom can be in two places at once or not exist at all)
    • With this information, it is illogical to have some moving frosty air during freezing.
    • Also with this information, the Zero Point Energy Machine description mentioning "pure coldness" is not possible in real life.
    • It also is illogical that the MOAB-class remain unaffected by extreme coldness, even though all other bloons froze. However, in the mobile versions of BTD, this ability will slow MOAB-class but the Glue Striker ability will not.
  • This ability can backfire if you do not have any towers that can pop frozen bloons, so you will need towers that can pop frozen bloons, such good towers would be Bomb Shooters and Juggernauts .


BTD6 Absolute Zero

BTD6 artwork

  • The previous upgrade, Snowstorm, is a weaker variation of the BTD5 Absolute Zero, being unable to fully freeze White and Zebra Bloons, however this upgrade is better being able to freeze everything excluding the B.A.D., including M.O.A.B-Class Bloons.
  • Absolute Zero formerly joined Super Brittle as the Tier-5 upgrades with the smallest range (besides Sniper, Heli, Ace, Mortar, whose displayed range simply doesn't count as "range"), but this was no longer the case in Version 7.0, since Absolute Zero now has double the range of a normal Ice Monkey.
  • Unlike Bloons TD Battles Mobile, Absolute Zero in BTD6 received price decreases and mechanic buffs instead of price increases.
  • After Version 8.0, when all farming-only abilities (including Tier 5 upgrades in this case) are required to undergo a full initial cooldown duration, the Absolute Zero ability is one of four abilities that, when bought, has the cooldown up immediately. The others are Pirate Lord, MOAB Eliminator, and Total Transformation.
  • In the BTD6 subreddit, there is a recurring meme since around the release of Version 8.0 whereby various users suggested a buff to the freezing of its main attack and ability from 2 to 5, writing "Absolute Zero freezes more (2 --> 5)".
    • In Version 17.0, its freeze penetration has been buffed, but only from 2 layers to 4.

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