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.
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.They ignore the river and take direct diagonal lines.
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.
Targeting MechanicPlayer ActionClosest Target LogicThe enemy will always hit the skeleton firstRetargetingIf 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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