Quad Darts is the Heli Pilot's path 1 tier 1 upgrade in mobile version of Bloons Monkey City. It increases the number of dart projectiles the Heli Pilot fires at a time from its main attack from 2 to 4. The two additional projectiles are offset slightly behind and to the left and right of the first two.
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Quad Dart's notable improvement to the Heli Pilots damage allows it to start many tiles that aren't Camo Craziness. It is cheap enough that at a max City Level and with both Magic Coin Purse Special Items that a player can start with it and a Banana Plantation on round 1 of any tile. Unfortunately due to the low quality of the Heli Pilots tier 3 and 4 upgrades, it does not build into anything useful except an Apache Dartship.