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.
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.Timing must be faster against fast troops. Advanced Aggro Tricks
Large tanks have massive hitboxes, meaning melee defenders can attack them from slightly further away than smaller troops.

For example, if an enemy Miner is locked onto your tower, you can deploy a large tank directly on top of him.
Character ClassAggro BehaviorSiege TargetersCompletely ignore all enemy troops, making them incredibly easy to kite across the entire map with cheap structuresFast AttackersOften have dash abilities that lock onto targets from far away; must be intercepted before the dash animation begins 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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