Strong

 is a target priority appearing in every Bloons TD game since the Bloons TD 4 Generation. It is the fourth (third in BTD4) target priority of most towers in the game. Towers set on the Strong target priority will target the strongest detectable bloon within its visible range. If multiple bloons have the same "strongest" health, then the tower will prioritize attacking the bloon closest to the exit, like the First target priority,

In Bloons TD 6, some attacks are locked on Strong. These include, but are not limited to:
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 * Druid of the Jungle's vine attack
 * Monkey Pirates' and Pirate Lord's hook abilities
 * MOAB Assassin and MOAB Eliminator abilities
 * First Strike ability missiles
 * Striker Jones' Concussive Shell ability
 * The fourth-from-the-top barrel of both Bloon Area Denial System and Bloon Exclusion Zone when either are set on Target Independent
 * The sixth-from-the-top barrel of Bloon Exclusion Zone when set on Target Independent
 * One of the dart/bomb streams of the Flying Fortress
 * Bloon Master Alchemist's shrink potions
 * Inferno Ring's meteor
 * Pat Fusty's Big Squeeze ability
 * If Etienne has four drones:
 * Two of the drones if set on Divide and Conquer
 * One of the drones if set on Zone Defense

Some attacks in Bloons TD 6 were previously locked on Strong. These included Sticky Bomb and Master Bomber's sticky bombs, Ezili's MOAB Hex starting target.