Gives the monkey a catapult that hurls giant spiked balls.
~ BTD 4 Description
Converts the Dart Monkey into a Spike-O-Pult, a powerful tower that hurls a large spiked ball instead of darts. Good range, but slower attack speed. Each ball can pop 18 bloons.
~ BTD5 Description
Converts the Dart Monkey into a Spike-o-pult that hurls a large spiked ball instead of darts. Good range, but slower attack speed. Each ball can pop lots of Bloons.
~ BTD6 Descripion

The Spike-o-pult appears as its own tower in BTD3, and as an upgrade for the Dart Monkey in all versions of BTD4, all versions of BTD5, all versions of BTD Battles and all versions of Bloons Monkey City and BTD6.

In Bloons TD 3, the Spike-O-Pult appears as a tower separate from the Dart Monkey, with 1 damage and 6 pierce per spike ball. Longer Range made the Spike-O-Pult increase range, while Faster Reload made the Spike-O-Pult shoot faster. Juggernaut increased the Spike-O-Pult's popping power and pierce, and Triple Shot allowed the Spike-O-Pult to shoot 3 spikes at once.

In Bloons TD 4 and Bloons TD 4 Expansion, this upgrade is the Dart Monkey's third upgrade. On Easy this upgrade costs $255, on Medium it costs $300, and on Hard it costs $325. The Triple Shot upgrade from Bloons TD 3 was renamed for Bloons TD 4. It became the Dart Monkey's 4th upgrade and was called Multi Shot. Place these towers at the end of long lines with target priority set to last for maximum effectiveness.

In Bloons TD 5, it is about 3x bigger than previous versions. The Spike-O-Pult is the third upgrade on the first path of the Dart Monkey; and it costs $425 on Easy, $500 on Medium, $540 on Hard and $600 on Impoppable.

In Bloons TD 6, the upgrade returns as the third upgrade of Path 1 for the Dart Monkey. It costs $255 on Easy, $300 on Medium, $325 on Hard, and $360 on Impoppable. It pops up to 22 (23 with Monkey Knowledge) bloons instead of 18, deals one additional damage to ceramics, and can pop Frozen Bloons. Like BTD4 and BTD5, attack speed decreases with this upgrade, specifically from per 0.95s to 1.15s.

BTD3 upgradesEdit

Table based on iOS version

Type Easy Medium Hard
Tower Cost 0-0 460 540 565
Longer Range 1-x 215 250 265
Faster Reload x-1 215 250 265
Juggernaut 2-x 700 825 865
Multi Shot x-2 490 575 605
Total Sell Amount N/A 1664 1952 2052

Table based on PC version

Type Easy Medium Hard
Tower Cost 0-0 510 610 650
Longer Range 1-x 215 255 270
Faster Reload x-1 215 255 270
Juggernaut 2-x 700 840 890
Multi Shot x-2 490 585 620
Total Sell Amount N/A 1776 2028 2120


  • The tower starts with an attack with 1 damage, 6 pierce, and is fired every 1.65 seconds.
  • Longer Range is approximately a ~17.9% increase in range.
  • Juggernaut gave an additional 14 pierce, making the total pierce 20. (unconfirmed: may also give extra ceramic damage)
  • Faster Reload made the reload 82%, making it attack every 1.35 seconds.
  • Multi Shot only increases the projectile size, and does not actually make the tower produce additional projectiles.

Differences Between BTD5 Flash and BTD5 MobileEdit

Buff Super Monkey Fan Club can affect Spike-O-pults.

Update History (Bloons TD Battles Mobile)Edit


Nerf Super Monkey Fan Club no longer affects Spike-O-Pults (or Juggernauts).


Buff Spike-O-pult popping power increased (18 → 40).

Version History (BTD6)Edit


Buff Spike-O-Pult now bounces off obstacles

  • Buff Spike-O-Pult now can damage Frozen Bloons.
  • Buff Spike-O-Pult attack speed penalty decreased (1.25s --> 1.15s). Does not affect Juggernaut.



  • It appears to be based on the onager, a type of catapult that uses tension to power the shot. The onager, aka. mangolnel is named after a wild species of donkey because of the intense force with which the projectile is shot, causing the device to jump forward every shot.
  • The way the monkey holds the Spike-O-Pult changes as the Bloons TD series progresses. In Bloons TD 3, he holds it with his right hand, in Bloons TD 4 he holds it with his tail, and in Bloons TD 5, he holds it with both hands.

    Hypersonic Spike-O-Pult

  • In BTD4, spiked balls won't explode if you have Splodey Darts. In BTD5 if you have Splodey Darts, it won't explode until they have popped 18 bloons or hit a lead bloon, so Splodey Darts are not very useful with Spike-O-Pult.
  • In BTD4 and BTD5 the Spike-O-Pult is an upgrade to the Dart Monkey, but in BTD3 the Spike-O-Pult was an independent tower. This makes it the first tower to become an upgrade for another tower.
  • If players place a 2-0 Dart Monkey near a Dart Monkey with Super Monkey Fan Club upgrade, then if the player uses the ability and once the 2-0 Dart Monkey has transformed into a Super Monkey, upgrade it to Spike-O-Pult then it change into a Spike-O-Pult Dart Monkey but it will shoot as fast as a Super Monkey for the duration of the Super Monkey Fan Club ability. It also happens with the Juggernaut upgrade if players upgrade to it fast enough.
    • If it has already been upgraded, it will turn into a Super Monkey who occasionally throws spiked balls.
  • In BTD4 and BTD6, the Spike-O-Pult upgrade shrinks the Dart Monkey operating it.
  • The Spike-O-Pult shoots slower than the upgrade before it.
  • This tower is least effective on First targeting when the bloons are moving away, and most effective on Last when the bloons are moving towards it.
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