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
Every single unit in the game possesses a hidden ‘sight range’ value, usually measured in invisible tiles.

Understanding exactly how many tiles a unit can ‘see’ allows you to place distractions at the absolute maximum possible distance.
Memorize specific tile locations.If a unit is already locked onto a tower, it will ignore closer targets.Adjust your placements for air threats. Advanced Aggro Tricks
You can use the physical bulk of your own units to literally push enemy troops out of their preferred path.

For example, if an enemy Miner is locked onto your tower, you can deploy a large tank directly on top of him.
AI LogicTactical ApplicationProximity PriorityPlace a cheap skeleton exactly one tile closer to the enemy than your fragile ranged attackerAggro Reset on StunIf an Inferno Tower locks onto your tank, stun it with a spell while placing a swarm nearby Drilling the Mechanics
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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