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Piercing Darts is an upgrade is an upgrade for the Dart Monkey that appears in Bloons TD 1, Bloons TD 2, Bloons TD 3, and Bloons TD 4. This upgrade allows the Dart Monkey to throw darts that can pop 2 bloons at a time. The Dart Monkey cannot pop one bloon twice in one shot (a good example being that you cannot pierce a Green Bloon with one Piercing Dart and have it pop down to a Red Bloon).
The appearance of a Piercing Darts Dart Monkey is the exact same as that of an un-upgraded Dart Monkey in Bloons TD 1, Bloons TD 2, and Bloons TD 3. In Bloons TD 4, it has a little arrow on it to indicate its rank.
BTD3: $120 (Easy], $145 (Medium), $150 (Hard)
BTD4: $120 (Easy), $140 (Medium), $150 (Hard)