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.

Understanding exactly how many tiles a unit can 'see' allows you to place distractions at the absolute maximum possible distance.
They are easier to distract with cannons or teslas.They will ignore targets that are just a few tiles away.A fast unit will cross tiles quickly, altering the math. 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.
AI LogicHow to Exploit ItProximity PriorityPlace a cheap skeleton exactly one tile closer to the enemy than your fragile ranged attackerAggro Reset on StunThe tower will rescan and target the swarm Drilling the Mechanics
Reading about aggro ranges is completely different from actually executing pixel-perfect placements in the heat of a live match.

Once you internalize the invisible grid that governs the AI, the game slows down dramatically.

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