This system of prioritization is known as 'aggro' (aggression), and mastering it is the most critical mechanical skill in the game.

Top-tier players use their deep understanding of aggro mechanics to lead enemy armies on wild goose chases around the map.
How Units See the Arena
If multiple enemies are within that radius, the AI will almost always lock onto the absolute closest target mathematically.

As long as you place a building just barely inside the tank's sight range, the tank will alter its path and walk toward your building.
Building-targeting units usually have larger sight ranges.Place distractions closer to them.Always account for the unit's movement speed. Manipulating the Z-Axis and Hitboxes
One of the most complex aspects of aggro management involves understanding the physical size, or 'hitbox', of different units.

For example, if an enemy Miner is locked onto your tower, you can deploy a large tank directly on top of him.
Aggro RuleTactical ApplicationClosest Target LogicPlace 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 Practice Makes Perfect
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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