The Spike-o-Pult is a tower in Bloons Tower Defense 3 and an upgrade for the Dart Monkey in later TD games in the Bloons Tower Defense series. It has great pierce which varies between the games, but is balanced by a lower rate of fire than most other towers. It is made even stronger in Bloons Tower Defense 5 when it was granted the Juggernaut upgrade, which gives it a huge damage increase and the ability to pop Lead Bloons.

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