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.
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.
Count the squares to ensure perfect placement.You must use a stun spell (like Zap) to force it to rescan.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.
This highly advanced technique, known as 'body blocking', requires absolute precision but can save hundreds of tower hitpoints.
AI LogicTactical ApplicationDistance RulePlace 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
Mastering the Grid
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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