This system of prioritization is known as 'aggro' (aggression), and mastering it is the most critical mechanical skill in the game.

If you cannot reliably predict which target an enemy unit will choose to attack, you are relying entirely on luck.
The Concept of Sight Range
If multiple enemies are within that radius, the AI will almost always lock onto the absolute closest target mathematically.

If a massive, slow-moving tank is lumbering toward your tower, you do not need to place your defense directly in front of it.
They are easier to distract with cannons or teslas.Place distractions closer to them.Always account for the unit's movement speed. The Geometry of Defense
One of the most complex aspects of aggro management involves understanding the physical size, or 'hitbox', of different units.

The physical mass of the tank will actually push the Miner backward, forcing him to lose range on the tower and retarget onto the tank.
AI LogicHow to Exploit ItClosest Target LogicPlace a cheap skeleton exactly one tile closer to the enemy than your fragile ranged attackerRetargetingIf an Inferno Tower locks onto your tank, stun it with a spell while placing a swarm nearby Practice Makes Perfect
You must spend hours in friendly battles practicing these specific interactions until they become pure muscle memory.

You will no longer panic when a massive push approaches; you will simply calculate the optimal placement and watch the AI dance to your tune.

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