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
When a unit is deployed or finishes destroying a target, it scans its specific sight range for the closest valid enemy.

Understanding exactly how many tiles a unit can 'see' allows you to place distractions at the absolute maximum possible distance.
Memorize specific tile locations.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 MechanicHow to Exploit ItClosest Target LogicThe enemy will always hit the skeleton firstAggro Reset on StunIf an Inferno Tower locks onto your tank, stun it with a spell while placing a swarm nearby Drilling the Mechanics
You must spend hours in friendly battles practicing these specific interactions until they become pure muscle memory.

Control the aggro, control the arena.

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