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.Timing must be faster against fast troops.
The Geometry of Defense
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 PriorityThe enemy will always hit the skeleton firstVision RefreshIf 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.
Once you internalize the invisible grid that governs the AI, the game slows down dramatically.
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