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
Every single unit in the game possesses a hidden 'sight range' value, usually measured in invisible tiles.
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.If a unit is already locked onto a tower, it will ignore closer targets.Flying units often have different pathing rules.
Manipulating the Z-Axis and Hitboxes
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.
Aggro RulePlayer ActionProximity PriorityPlace 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
Mastering the Grid
Have a clanmate repeatedly send the same tank down the lane while you try to pull it to the center using different tiles.
Control the aggro, control the arena.
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