Caltrops (BTDB2)

Caltrops is the 2nd upgrade of Path 3 for the Ninja Monkey in Bloons TD Battles 2. Like its BTD6 counterpart, it drops caltrops that act like Spike Factory spikes. However, caltrops are nerfed to have a 25s lifespan instead of 70s. Upgrade is also cheaper in this game.

It costs $300.

Summary
Stockpiling damage from a Ninja Monkey is nice to have. It also gives a very slight DPS boost for the Ninja.

Tips

 * 1-0-2 also increases rate of dropping Caltrops.