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

This article will dissect the mathematics of sightlines, retargeting, and unit hitboxes to help you manipulate the AI flawlessly.

Vision and Targeting

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.

• Building-targeting units usually have larger sight ranges.
• Place distractions closer to them.
• A fast unit will cross tiles quickly, altering the math.

Advanced Aggro Tricks

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.

Targeting Mechanic	How to Exploit It
Proximity Priority	Place a cheap skeleton exactly one tile closer to the enemy than your fragile ranged attacker
Retargeting	If an Inferno Tower locks onto your tank, stun it with a spell while placing a swarm nearby

Drilling the Mechanics

Reading about aggro ranges is completely different from actually executing pixel-perfect placements in the heat of a live match.

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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