First

 is a target priority, first released in Bloons TD 1. It is the default target priority of the majority of the towers in the game, and is the only target priority in BTD1 and BTD2. Towers set on the First target priority will target the bloon closest to the exit within its visible range.

There are a few exceptions to the First target priority. Etienne, who operates drones, each have their own separate target priority. He has limited options to change each drone's target priority. However, he does have a universal First targeting priority; setting his targeting priority to First causes all of his drones to target First.

In Bloons TD 6, some attacks are locked on First. These include, but are not limited to:
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 * All Heli Pilot projectiles
 * Spectre's dart-and-bomb attacks
 * One stream out of three of Flying Fortress's dart-and-bomb attacks
 * Captain Churchill's SMG (also referred as a "machine gun")
 * The first-from-the-top barrel of both Bloon Area Denial System and Bloon Exclusion Zone when either are set on Target Independent
 * The fifth-from-the-top barrel of Bloon Exclusion Zone when set on Target Independent