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.
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.
- Building-targeting units usually have larger sight ranges.
- Melee units have very short sight ranges.
- Always account for the unit's movement speed.
Advanced Aggro Tricks
You can use the physical bulk of your own units to literally push enemy troops out of their preferred path.
This highly advanced technique, known as 'body blocking', requires absolute precision but can save hundreds of tower hitpoints.
| Aggro Rule | How to Exploit It |
|---|---|
| Distance Rule | The enemy will always hit the skeleton first |
| Aggro Reset on Stun | If an Inferno Tower locks onto your tank, stun it with a spell while placing a swarm nearby |
Drilling the Mechanics
Reading about aggro ranges is completely different from actually executing pixel-perfect placements in the heat of a live match.

You will no longer panic when a massive push approaches; you will simply calculate the optimal placement and watch the AI dance to your tune.
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