Armor Piercing Darts is the fourth upgrade in the 3rd Path for the Monkey Sub in BTD6. It causes the homing darts fired by the Monkey Sub to deal 1 bonus damage to MOAB-Class Bloons. Because of the Airburst Darts, it deals 8 damage per shot (10 with the Monkey Knowledge Quad Burst). It costs $2550 on Easy, $3,000 on Medium, $3240 on Hard and $3600 on Impoppable.
Strategy
When combined with other Armor Piercing Darts Subs and a Sub Commander, it becomes a massive Anti-MOAB force, even in later stages of the game.
